Click on "Settings" in the black bar at the top, then choose "Profile Photo" from the menu at the top. There are other ways to get to it, but I think that's the easiest.
There's this long gray thingy coming out of my wall. It's attached to a box with pretty green flashing lights. Then a orange thingy goes from it to my computer. Can I have a cookie, now? Actually what I meant was I can't get a pic from my old flip phone into my computer.