dose anyone know how to become a fan of someone?

It's really simple:
1. Go to their profile by clicking on their name next to any of their content or 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 you 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.