Here's a picture that gives you an idea of what the setup should be:
Seafarer 22 - Great Boat, Great Price!
Do a google search and you'll find all kinds of ways to step masts. Read a lot before doing anything. Send me a pm with a link to your photo page and I'll post it for you. But you need to get the bottom bolt that holds the base of the mast in place. And 3 friends. Preferably tall ones.