I have to agree with others, this feels unfinished or incomplete.
You will need a Membership Plugin, while I suspected this support confirmed in an email after I asked. So it will be up to you to 'find' one and configure this. Not ideal as I would rather pay more to have all this build in.
The function is sleek and minimal which was ideal for what we were looking for. Just needs more guidance on set up and what you'll need to actually make this complete and work within your website.