You find a picture that you like and then save it. The you go to facebook and click on the spot for you profile picture. In the corner it will say change picture. Click on that. Click browse to find the picture that you like. Check box to certify the pic is yours. Click upload to upload picture. Your picture will show up in the thumbnail version. If you want to reposition it then click and drag the pic till you are pleased with its position. Click on save thumbnail version. Go to bottom of page a push save your settings.