Put the icon on your desktop in your Apps folder. If it's already there, delete the one from your desktop. You may have to put the icon (from the apps folder) into your dock and remove the icon that's already there.
PS - why are you using MSN? Download adium... it does MSN, AIM, Jabber, QQ, facebook... really everything.
Cheers mate. But don't either of them do webcam. I dont mind not using it , but can I not view someone elses?