OK The EXP you gain is just under your post area on the right side of your profile on posts and it is also in your profiles.
when you reach a amount of exp, you level up. here are those amounts.
0 - LV 1
100 - LV 2
200 - LV 3
400 - LV 4
800 - LV 5
1600 - LV 6
3600 - LV 7
7200 - LV 8
14400 - LV9
and so on. the last exp is multiplied by 2 to get the next amount.
100 x2 = 200
200 x2 = 400
400 x2 = 800
etc... when you reach required EXP, Pm an admin (me or Senko) and we will update your stats.