I'm trying to homebrew a druid subclass, and I can't seem to find a way to edit the components of the Wildshape description, such as max CR, movement restrictions, rules while transformed, etc. Could someone help me with this?

I would use Moon druid as your base, since it's the only one of the published subclasses that changes any of those components. And even then it only changes the CR, so that's the only one the tools might allow you to change. And even for Moon druids the general druid requirements still appear in some areas of the character sheet. Probably the best you're going to get is a simple text description of the changes.