Code Snippet

If you are building a website for a non-techy person, then it will be good to add a custom message to the editor pane. Doing this will add more value to the end user’s pace while this can be achieved simply by copying the following snippet in your theme’s functions.php file.

function wptutsplus_text_after_title( $post_type ) { ?>
    <div class="after-title-help postbox">
        <h3>Using this screen</h3>
        <div class="inside">
            <p>Use this screen to add new articles or edit existing ones. Make sure you click 'Publish' to publish a new article once you've added it, or 'Update' to save any changes.</p>
        </div><!-- .inside -->
    </div><!-- .postbox -->
<?php }
add_action( 'edit_form_after_title', 'wptutsplus_text_after_title' );

function wptutsplus_text_after_title( $post_type ) { ?>

<h3>Using this screen</h3>

<p>Use this screen to add new articles or edit existing ones. Make sure you click 'Publish' to publish a new article once you've added it, or 'Update' to save any changes.</p>

</div>

</div>

<?php }

add_action( 'edit_form_after_title', 'wptutsplus_text_after_title' );

Snippet Source/Credit: WP Tuts

How To Add A Custom Message To The Editor Pane