Add message to Add Article page
You can use markup module to add html text as fields to the article content type.

If you want to show the html text only in edit page then you need to use hook form alter

function mymodule_form_alter(&amp;$form, &amp;$form_state, $form_id) {
  if ($form_id == 'article_node_form' &amp;&amp; arg(2) == "edit") {    
    $form['contact_information'] = array(
      '#markup' =&gt; 'Your message goes here !',
    );
  }  
}