1. Navigate to the WordPress plugin directory of your development installation.
2. Navigate to the ch8-bug-tracker directory and edit ch8-bug-tracker.php.
3. Find the ch8bt_config_page function and locate the bracket that closes out the if statement (<?php } ?>) situated toward the end of its body.
4. Insert the following code block right before the closing bracket from the if statement identified in the previous step:

<?php } elseif ( isset( $_GET['id'] ) &&
                 ( 'new' == $_GET['id'] ||  
                   is_numeric( $_GET['id'] ) ) ) {                  
    $bug_id = intval( $_GET['id'] ); 
    $mode = 'new'; 
         
    // Query database if numeric id is present 
    if ( $bug_id > 0 ) { 
        $bug_query = 'select * from ' . $wpdb->get_blog_prefix(); 
        $bug_query .= 'ch8_bug_data where bug_id = %d'; 
 
        $bug_data =
            $wpdb->get_row( $wpdb->prepare( $bug_query, $bug_id ), 
                            ARRAY_A ); 
 
        // Set variable to indicate page mode 
        if ( $bug_data ) {
            $mode = 'edit'; 
        }
    } 

    if ( 'new' == $mode ) {
        $bug_data = array(
            'bug_title' => '', 'bug_description' => '',
            'bug_version' => '', 'bug_status' => ''
        ); 
    }
 
    // Display title based on current mode 
    if ( 'new' == $mode ) { 
        echo '<h3>Add New Bug</h3>'; 
    } elseif ( 'edit' == $mode ) { 
        echo '<h3>Edit Bug #' . $bug_data['bug_id'] . ' - '; 
        echo $bug_data['bug_title'] . '</h3>'; 
    } 
    ?> 
  
    <form method="post"  
          action="<?php echo admin_url( 'admin-post.php' ); ?>"> 
    <input type="hidden" name="action" value="save_ch8bt_bug" /> 
    <input type="hidden" name="bug_id" 
           value="<?php echo $bug_id; ?>" /> 
 
    <!-- Adding security through hidden referrer field --> 
    <?php wp_nonce_field( 'ch8bt_add_edit' ); ?> 
 
    <!-- Display bug editing form --> 
    <table> 
        <tr> 
            <td style="width: 150px">Title</td> 
            <td><input type="text" name="bug_title" size="60"
                       value="<?php echo esc_html( 
                       $bug_data['bug_title'] ); ?>"/></td> 
        </tr> 
        <tr> 
            <td>Description</td> 
            <td><textarea name="bug_description"  
            cols="60"><?php echo
esc_textarea( $bug_data['bug_description'] ); ?></textarea></td> 
        </tr> 
        <tr> 
            <td>Version</td> 
            <td><input type="text" name="bug_version" 
                       value="<?php echo esc_html( 
                       $bug_data['bug_version'] ); ?>" /></td> 
        </tr> 
        <tr> 
            <td>Status</td> 
            <td> 
                <select name="bug_status"> 
                <?php  
                // Display drop-down list of bug statuses
                $bug_statuses = array( 0 => 'Open', 1 => 'Closed',
                                       2 => 'Not-a-Bug' );
                foreach( $bug_statuses as $status_id => $status ) { 
                    // Add selected tag when entry matches 
                    echo '<option value="' . $status_id . '" '; 
                    selected( $bug_data['bug_status'], 
                              $status_id ); 
                    echo '>' . $status; 
                } 
                ?> 
                </select> 
            </td> 
        </tr> 
    </table> 
    <input type="submit" value="Submit" class="button-primary" /> 
</form> 

5. Add the following line of code to register a function that will be called on the initialization of the administration page:

add_action( 'admin_init', 'ch8bt_admin_init' ); 

6. Add the following block of code at the end of the plugin file to register a function to be called when bugs are created or updated:

function ch8bt_admin_init() { 
    add_action( 'admin_post_save_ch8bt_bug', 'process_ch8bt_bug' ); 
} 

7. Append the following block of code to process user-submitted data and store it in the website database:

function process_ch8bt_bug() {  
    if ( !current_user_can( 'manage_options' ) ) {
        wp_die( 'Not allowed' );
    }
 
    // Check if nonce field is present for security 
    check_admin_referer( 'ch8bt_add_edit' ); 
    global $wpdb;

    // Place all user submitted values in an array (or empty 
    // strings if no value was sent) 
    $bug_data = array(); 
    $bug_data['bug_title'] = ( isset( $_POST['bug_title'] ) ?
        sanitize_text_field( $_POST['bug_title'] ) : '' ); 
 
    $bug_data['bug_description'] =
        ( isset( $_POST['bug_description'] ) ? 
          sanitize_text_field( $_POST['bug_description'] ) : '' ); 
  
    $bug_data['bug_version'] = ( isset( $_POST['bug_version'] ) ? 
        sanitize_text_field( $_POST['bug_version'] ) : '' ); 
 
    // Set bug report date as current date 
    $bug_data['bug_report_date'] = date( 'Y-m-d' ); 
 
    // Set status of all new bugs to 0 (Open) 
    $bug_data['bug_status'] = ( isset( $_POST['bug_status'] ) ? 
        intval( $_POST['bug_status'] ) : 0 ); 
 
    // Call the wpdb insert or update method based on value 
    // of hidden bug_id field 
    if ( isset( $_POST['bug_id'] ) && 0 == $_POST['bug_id'] ) { 
        $wpdb->insert( $wpdb->get_blog_prefix() . 'ch8_bug_data', 
                       $bug_data ); 
    } elseif ( isset( $_POST['bug_id'] ) && 
               $_POST['bug_id'] > 0 ) { 
        $wpdb->update( $wpdb->get_blog_prefix() . 'ch8_bug_data',  
            $bug_data, 
            array( 'bug_id' => intval( $_POST['bug_id'] ) ) ); 
    } 
 
    // Redirect the page to the user submission form
    wp_redirect( add_query_arg( 'page', 'ch8bt-bug-tracker', 
                     admin_url( 'options-general.php' ) ) ); 
    exit; 
} 

8. Save and close the plugin file.
9. Navigate to the new Bug Tracker item under the administration page's Settings menu and click on the Add New Bug link to create an entry:

10. Click on Submit to store the new bug in the website database. The newly created bug will appear in the bug listing created in the previous recipe.
11. Click on the new entry's name to review its information and update it.