what exactly do you man by "pictures?" Cause if you think your going to save images/art by people, then your stealing. Unless you have permission from the owner to do so. Screenshots however are fine.

It's the same way you upload a picture to be your facebook icon. Just right click and save the image, and upload it to your profile picture gallery.

not 100 percent sure what you're asking but the way I put pics on facebook of balto source is right click then save image then upload it out of your doccuments on facebook that's how I did it and it has to be yours you can't steal it (use someone eleses work)