Ok, the avatar with more suited size you can download at the bottom of this message.
Once you downloaded it you need to go to 'Control Panel' (there is a link on the left side of the screen at
www.legionhq.org). In there, choose 'Edit Options at the top'. At the bottom of that page, press 'Choose avatar'. At the bottom of teh page you can see: 'You can upload an avatar from your computer'. Select the file u downloaded and press 'Submit Modifications'. If that doesnt work it means you have to put it online somewhere. In that case shout and ill help ya out