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If you go into 'your control panel' (UserCP) to SETTINGS AN OPTIONS and go to EDIT AVATAR, you can either use what's available, or upload one of your own.
Maybe now your 'username' has turned GREEN, you should be able to do it.
If you go to the bottom of the EDIT AVATAR page, you will see an option button to CHOOSE FILE. That should then take you to an image you hold on your PC.