1. Navigate to the WordPress plugin directory of your development installation.
2. Create a new directory called ch6-book-review-user-submission and open it.
3. Create a text file called ch6-book-review-user-submission.php.
4. Open the new file in a code editor and add an appropriate header at the top of the plugin file, naming the plugin Chapter 6 - Book Review User Submission.
5. Add the following line of code to declare a new shortcode and its associated function:

add_shortcode( 'submit-book-review', 'ch6_brus_book_review_form' ); 

6. Add the following code segment to provide an implementation for the ch6_brus_book_review_form function:

function ch6_brus_book_review_form() { 
    // make sure user is logged in 
    if ( !is_user_logged_in() ) { 
        echo '<p>You need to be a website member to be able to '; 
        echo 'submit book reviews. Sign up to gain access!</p>'; 
        return; 
    } 
    ?> 
 
    <form method="post" id="add_book_review" action=""> 
 
    <!-- Nonce fields to verify visitor provenance --> 
    <?php wp_nonce_field( 'add_review_form', 'br_user_form' ); ?>

    <table> 
        <tr> 
            <td>Book Title</td> 
            <td><input type="text" name="book_title" /></td> 
        </tr> 
        <tr> 
            <td>Book Author</td> 
            <td><input type="text" name="book_author" /></td> 
        </tr> 
        <tr> 
            <td>Review</td> 
            <td><textarea name="book_review_text"></textarea></td> 
        </tr> 
        <tr> 
          <td>Rating</td> 
            <td><select name="book_review_rating"> 
            <?php 
            // Generate all rating items in drop-down list 
            for ( $rating = 5; $rating >= 1; $rating-- ) { ?> 
                <option value="<?php echo $rating; ?>"> 
                               <?php echo $rating; ?> stars 
            <?php } ?> 
            </select> 
            </td> 
        </tr> 
        <tr> 
            <td>Book Type</td> 
            <td> 
            <?php  
            // Retrieve array of all book types in system 
            $book_types = get_terms( 'book_reviews_book_type', 
                                 array( 'orderby' => 'name', 
                                        'hide_empty' => 0 ) ); 
 
            // Check if book types were found 
            if ( !is_wp_error( $book_types ) && 
                 !empty( $book_types ) ) { 
 
                echo '<select name="book_review_book_type">'; 
 
                // Display all book types 
                foreach ( $book_types as $book_type ) { 
                     echo '<option value="' . $book_type->term_id; 
                     echo '">' . $book_type->name . '</option>'; 
               }     
 
               echo '</select>'; 
            } ?> 
            </td> 
        </tr> 
    </table> 
 
    <input type="submit" name="submit" value="Submit Review" /> 
    </form> 
<?php } 

7. Save and close the plugin file.
8. Activate the Chapter 6 - Book Review User Submission plugin.
9. Create a new page and insert the newly created [submit-book-review] shortcode in the item's content.
10. Publish and view the page to see the form. If you submit the form, nothing will happen at the moment, since we have not implemented a processing function to parse and save the submitted data: