No "Arcade menu" in AdminCP - Please help!!!

Just installed this... everything looks fine... was really happy with it... until I tried to play a game! That's when it said I didn't have permission! Went back over the install guide and apparently I'm supposed to have an "Arcade" link in my admincp where I can set up permissions etc. ...but it just isn't there... any ideas why it's not there?

[choccyclaire]

Check to make sure you aren't missing cpnav_arcade.xml in your includes folder.