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 add the following highlighted code block at the end of the bug listings section after the end of the existing deletion form:

<input type="submit" value="Delete Selected"
       class="button-primary"/> 
</form>

<!-- Form to upload new bugs in csv format --> 
<form method="post"  
      action="<?php echo admin_url( 'admin-post.php' ); ?>"   
      enctype="multipart/form-data">

<input type="hidden" name="action" value="import_ch8bt_bug" />   
<!-- Adding security through hidden referrer field --> 
<?php wp_nonce_field( 'ch8bt_import' ); ?>

<h3>Import Bugs</h3> 
<div class="import_data">Import Bugs from CSV File 
    (<a href="<?php echo plugins_url( 'importtemplate.csv', 
                                      __FILE__ ); ?>">Template</a>) 
    <input name="import_bugs_file" type="file" /></div> 
<input type="submit" value="Import" class="button-primary"/> 
</form> 

4. Locate the ch8bt_admin_init function and add the following line of code at the end of its body to register a function to process submissions of the bug import form:

add_action( 'admin_post_import_ch8bt_bug', 'import_ch8bt_bug' );

5. Insert the following block of code to provide an implementation for the import_ch8bt_bug function:

function import_ch8bt_bug() { 
    // Check that user has proper security level 
    if ( !current_user_can( 'manage_options' ) ) {
        wp_die( 'Not allowed' );
    }

    // Check if nonce field is present 
    check_admin_referer( 'ch8bt_import' );

    // Check if file has been uploaded 
    if( array_key_exists( 'import_bugs_file', $_FILES ) ) { 
        // If file exists, open it in read mode 
        $handle =
            fopen( $_FILES['import_bugs_file']['tmp_name'], 'r' );

        // If file is successfully open, extract a row of data 
        // based on comma separator, and store in $data array 
        if ( $handle ) { 
            while ( FALSE !== 
                    ( $data = fgetcsv( $handle, 5000, ',' ) ) ) { 
                $row += 1;

                // If row count is ok and row is not header row 
                // Create array and insert in database 
                if ( count( $data ) == 4 && $row != 1 ) { 
                    $new_bug = array( 
                        'bug_title' => $data[0], 
                        'bug_description' => $data[1], 
                        'bug_version' => $data[2], 
                        'bug_status' => $data[3], 
                        'bug_report_date' => date( 'Y-m-d' ) );

                    global $wpdb;         
                    $wpdb->insert( $wpdb->get_blog_prefix() . 
                                   'ch8_bug_data', $new_bug ); 
                } 
            } 
        } 
    }

    // Redirect the page to the user submission form 
    wp_redirect( add_query_arg( 'page', 'ch8bt-bug-tracker', 
                     admin_url( 'options-general.php' ) ) ); 
    exit; 
} 

6. Save and close the plugin file.
7. Create a new text file in the plugin directory called importtemplate.csv and open it in a text editor.
8. Insert the following text in the newly created file to provide an example bug to import:

"Title","Description","Version","Status"
"Test Import Bug","This is a test import bug","1.0","0"

9. Save and close the CSV text file.
10. Navigate to the new Bug Tracker item under the administration page's Settings menu to see the new Import Bugs section.
11. Use the file import dialog to locate the importtemplate.csv.
12. Import the list of bugs in the system to see its content added to the database: