This is a great walk-through by Hobie SUP on how to install fins in your stand up paddle board. It’s the kind of thing everyone has to learn. This video will walk you through the basics of putting in and taking out fins.
While this video describes installing fins specifically in a Hobie Stand up paddle board, it applies to just about all stand up paddle boards or surf boards that have Futures Fins or FCS fins side fin boxes and standard center fins.
Center fins usually come with either a phillips head or flathead screwdriver screw. It’s good to keep both versions in your car. The FCS and Futures side fins (also called side bites) have basically a allen wrench “fin key.”