If you'd like to set up a workflow where you approve people who enter a specific vault, this is what you can do:Set up a landing page or website page where people can apply for access by filling out the form. If you want to ask questions other than the registrant's name or email, create a website custom page and use one or more of the additional lead capture fields.Once the landing page or web page is saved, put this link wherever you want to -- on your website menu, sending it out by email, posting on FB, etc.When someone registers, if you approve them to enter the vault, the email has a "View Contact" link. Click it, then scroll down and add them to that vault. If you don't approve, either ignore the email or click "reply" to tell them why.