You can add a link like <a href="http://example.com/index.php?your_action=delete&id=1">Delete</a>. Then in init hook use that function to delete that message. Check permission and nonce first if that user have permission to do so.
You can add a link like <a href="http://example.com/index.php?your_action=delete&id=1">Delete</a>. Then in init hook use that function to delete that message. Check permission and nonce first if that user have permission to do so.