Go into your Profile on here, click on edit user details, you should see a message saying your Avatar is active (or not). If not, then tick that box (if you can't see the box, tick in the general area under the YO of you in that message). Then go to the bottom of the page and check Submit. You need to give it a few minutes, if you can't see the avatar then keep doing control/F5 until it pops up. Good luck!