haha well i would suggest go to paint and make a small avatar maybe saying Gamehunter or whatever and save it.
Go to where you saved it and look at the picture.
Hold your mouse on it so it shows how many pixels it is.
If it is bigger than 100 times 100 than make it smaller until it is then upload it here.
If it is succesful then it will come on Custom avatar then click on it and Voila there you go.
My one was 97 times 89
So you try then
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