First you will have to figure out what picture you want, then you make sure it's on your computer's "pictures" area in your documents. If you want to change your avatar, the thing that is a question mark by your name, go to "User CP", then go down to "edit avatar". Then you upload the pic you want. Same thing for profile pictures, they just show up on your profile.
I haven't scheduled another open play yet. It will probably be the end of Feb or the beginning of March. HOWEVER, if you look at the event page, there is a Mil Sim happening on the 18th of Feb. It's gonna be a humdinger!!! Jonah is trying out some new and special Mil sim rules, so be sure to read up the rules on the event page and read the many pages for the game thread in 'upcoming games'. The Op is titled, "Dark Horizons".