edit :

hocam functions.php de options yarlarını buldum ama değiştirecek pek bişi bulamadım

<div class="wrap">
        <h2>iBizPress Magazine Settings</h2>
        
        <form method="post" action="options.php">
            <?php wp_nonce_field('update-options'); ?>
        
        <h3>Common Settings</h3>
            <table class="form-table">
                <tr valign="top">
                    <th scope="row">Feedburner ID</th>
                    <td><input type="text" name="ibiz_mag_feedburner_id" value="<?php echo get_option('ibiz_mag_feedburner_id'); ?>" /></td>
                </tr>
                <tr valign="top">
                    <th scope="row">Feedburner URL</th>
                    <td><input type="text" name="ibiz_mag_feedburner_url" value="<?php echo get_option('ibiz_mag_feedburner_url'); ?>" /></td>
                </tr>
                <tr valign="top">
                    <th scope="row">About Us</th>
                    <td><textarea name="ibiz_mag_about_us" id="ibiz_mag_about_us" cols="45" rows="5"><?php echo get_option('ibiz_mag_about_us'); ?></textarea></td>
                </tr>
            </table>
         
          <h3>Home Page Settings</h3>
              <table class="form-table">
                <tr valign="top">
                    <th scope="row">Video Category</th>
                    <td>
                        <select name="ibizmag_video_cat" id="ibizmag_video_cat"> 
                         <option value="0">[Select Category]</option> 
                         <?php 
                          $ibizmag_video_cat = get_option('ibizmag_video_cat');
                          
                          $categories = get_categories(''); 
                          foreach ($categories as $cat) {
                              $term_id = $cat->term_id;
                            $option = '<option value="'.$term_id.'"';
                            
                            if($term_id == $ibizmag_video_cat)
                            {
                                $option .= ' selected>';
                            }
                            else
                            {
                                $option .= '>';
                            }
    
                            $option .= $cat->cat_name;
                            $option .= '</option>';
                            echo $option;
                          }
                         ?>
                        </select>
                    </td>
                </tr>
            </table>
            
            <table class="form-table">