When i hover over the open player boxes it doesnt let me join, please advise.

Looks like i should update this a bit: 

http://www.wargear.net/wiki/doku.php?id=general:help:joining_or_creating_a_game

basically the colored boxes are just a representation of how full the game is, you need to click on the game name to bring up the 'join' page. 

if this doesn't help; post here and i'll update with screenshots.