There are several cases when you may need paid membership. Any membership site requires some setup according to your needs, currency, member levels, etc. If you want to setup membership site for Community – read this step by step tutorial
But if your purpose is to make different membership levels for multi vendor sites – currently we recommend to use Membership addon and WC Marketplace plugin (addon is not included in theme). This addon allows you to have inner system with different commission levels, product submit limit, trial periods and different capabilities for vendors.
Here you can find docs for plugin
Don’t forget that if you use our popup in theme option – user option, you must overwrite registration popup link to page where you have membership table (do this in theme option – user option)