If you meant that as a serious question, you click one of the 6 numbered buttons on the yellow panel by the left side of the submission's page. That'll award you 2 experience points. Once you have 10 you can deposit them and chill out until the next Newgrounds day, when you'll be able to start racking up experience again. It's a way of making experienced users more capable of either helping or hurting other people's submissions. Have fun!