What it means if i get "Novice"?

it means you've been a member of fanpop for a month
you can read that if you click on the cap

It isn't used for anything. Caps just mark certain milestones: like being here for a certain amount of time, being a fan of a certain number of other members or fanning a certain amount of things. In this case, the cap is marking the fact that you've been a member here for a month.