Below this may be a larger image known as an avatar; this is generally unique or personal to each user. It is up to the board administrator to enable avatars and they have a choice over the way in which avatars can be made available. If you are unable to use avatars then this is the decision of the board admin and you should ask them their reasons (we're sure they'll be good!)
I see that I am able to use avatars, but only those in the gallery. Is there any way that I can upload my own image?