dose anyone know how to become a fan of someone?

It's really simple:
1. Go to their profilo da clicking on their name successivo to any of their content o comments.
2. Select the "Add to Friend List" button which is on the bottom left of the first grey box.
3. This button will then change to say "You're a fan!"

If clicking on their name leads te to the fanpop main page instead of their profile, this means that their account has been closed. It isn't possible to fan someone who's account is closed.