Okay.. This sounds really stupid but I can't figure out how to change my profile pic on myspace... Plz help...

On your main page. Youll see your currrent picture. Then next to it it will say
Upload / Change Photos .. Click it and upload the picture(s) you want. :)

I think you mean you want to change your default profile picture. Well, you do what BoomerGirli said, click on Upload / Change Photos. Under each picture is a button that says '-Set as default-' and if you click on that it will change your profile picture to whichever picture you picked.

I hope this helps. Have a nice day! :)