Custom Admin, Users, WP/CP | Type: PHPAdd Contextual Help for Custom Post Types

The contextual help feature is a descending tab which can be seen in the top right of pages where available.

function my_contextual_help( $contextual_help, $screen_id, $screen ) { 
  if ( 'product' == $screen->id ) {

    $contextual_help = '<h2>Products</h2>
    <p>Products show the details of the items that we sell on the website. You can see a list of them on this page in reverse chronological order - the latest one we added is first.</p> 
    <p>You can view/edit the details of each product by clicking on its name, or you can perform bulk actions using the dropdown menu and selecting multiple items.</p>';

  } elseif ( 'edit-product' == $screen->id ) {

    $contextual_help = '<h2>Editing products</h2>
    <p>This page allows you to view/modify product details. Please make sure to fill out the available boxes with the appropriate details (product image, price, brand) and <strong>not</strong> add these details to the product description.</p>';

  }
  return $contextual_help;
}
add_action( 'contextual_help', 'my_contextual_help', 10, 3 );