wp admin - Add text to post list/edit screens? in WordPress

If you are OK with using javascript, you can try the following in your functions.php file:

add_action('admin_footer', 'my_admin_footer');
function my_admin_footer()
{ $uri = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : NULL ; $message = NULL; if ($uri AND strpos($uri,'edit.php')) { if (strpos($uri,'post_type=page')) { $message = 'My custom message for page list'; } else { $message = 'My custom message for post list'; } } elseif ($uri AND strpos($uri,'post-new.php')) { if (strpos($uri,'post_type=page')) { $message = 'My custom message for add/edit page'; } else { $message = 'My custom message for add/edit post'; } } elseif ($uri AND strpos($uri,'post.php')) { $message = 'My custom message for add/edit post or page'; } if ($message) { ?>
<script>
 jQuery(function($) { $('<p style="margin-bottom:15px; color:#999;">
</p>
').text('<?php echo $message; ?>
').insertAfter('#wpbody-content .wrap h2:eq(0)'); }); </script>
<?php }
}