Hi wooddragon and welcome to the forum,
I cannot understand the problem with the avatar. Size is usually the only issue, but I have a suggestion. Leave trying to upload alone for 24 hours and try again, if you are still having problems then post again.
As for your username, you are not able to change it, but I can, however there is a danger that in doing so you can lose your songbooks and you might have to start again with them. If you want to take the risk, please write to me privately and we will sort it out for you.
Roger
"Do, or do not; there is no try"