post_submitbox_misc_actions

post_submitbox_misc_actions.php

add_action('post_submitbox_misc_actions','my_post_option');
add_action( 'save_post', 'save_my_post_option' );

function my_post_option( ){
 echo '<div style="border-top:1px solid #DFDFDF;border-bottom:1px solid #FFF;clear:both;" id="post_anonym"><div style="padding: 6px 10px;float:left">';
 echo ' Hallo WordPress';
 echo '</div></div>';
}

function save_my_post_option( $post_id ) {
 // Hier können Daten gespeichert werden z.B. mit der Funktion update_post_meta();
}