The wereraven stat block shows that it has multiple walking and flying speeds depending on whether it's in its humanoid, hybrid, or raven form. I'm homebrewing a wereshark that would have walking and swim speeds depending on its form. How would you actually do that in the system? I made a copy of the wereraven, and I didn't see any indication in there of how they got the multiple speeds to work.

There is a whole homebrew forum for these kinds of questions. To answer your question, enter those details into the “notes/details” field when you attach the speed.