1. Dashboard >Design>Add a Page element >html/javascript
2. Copy code bawah nih 

<script language=JavaScript> <!--
//edit by unwanted

var message="Masukkan Mesej Anda Disini";
/////////////////////////////////// function clickIE4(){ if (event.button==2){ alert(message); return false; } }
function clickNS4(e){ if (document.layers||document.getElementById&&!document.all){ if (e.which==2||e.which==3){ alert(message); return false; } } }
if (document.layers){ document.captureEvents(Event.MOUSEDOWN); document.onmousedown=clickNS4; } else if (document.all&&!document.getElementById){ document.onmousedown=clickIE4; }
document.oncontextmenu=new Function("alert(message);return false")
// --> </script>