How to do template overrides in Membership2 Pro?

I’d like to customize some of the Membership2 Pro content, but I’m having trouble figuring out which files to edit (and I’m assuming I can create a “membership” folder in my theme in which to place my customized template files).

Specific views I want to adjust (to start with) are the Account page and the registration form (add some additional classes, etc).

Can you point me in the right direction to get started?