You have to load a picture through the upload center - 2nd blue hyperlink on the small boxes above the Northwest Fishing Board phrase or underneath the Radical Glow.com icon. Once you have succesfully uploaded you will get an e-mail with a URL in it. Paste that URL into the custom URL avatar field and voila, you will have it.
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"You're not a g*dda*n looney Martini, you're a fisherman"

R.P. McMurphy - One Flew Over The Cuckoo's Nest