To change your avatar (the image shown on the forums) or your profile picture (the image shown on your profile) click on setting on the upper right of the page and the options to change those should be on the left side of the screen from there. And to enlist for REDD go to the main forum page and look for "enlistment office" click on that and look for the REDD enlistment thread.

I cant figure out how to get a profile picture and How to change to Redd Team.