Profile pic ???

My friend emailed me pics froma wedding we attended last Friday, and hubby and I are in one of them. Not th ebest pic os us, but the only one I have saved, bceause our scanner is not working.
I want to know how do I tranfer it to my profile pic.


Or I have pics from ultimatewedding.com. Can I move one of those pics into my profile?? If so...how??
Thanks.