Login...click on "Settings" upper right hand corner of the page, on left hand side under the radial heading select "Edit Profile Pic".
You will have 2 choices: Choice #1 Copy an image pic off the net from say, Google Images. If you find an image you like click on it and it will open up on it's host website, close the pop-up window of the pic and find it on the website, then right click it on the pic, select "Copy Image URL", then go back box 1 in your "Edit Profile Pic dialog box and paste into the box.
Or
Go into box 2 and select Chose File, then select a picture from your own computer. Your picture will be autoformated to fit the profile pic.
Any problems let me know.....