Log In Screen for Validation

ONLY allow access to a form based on pre-approved email (or username). The welcome screen should be able to be set as a LOG IN or CREATE accounts -- like most app builders have. E.g. when creating ORDER FORMS, you don't want any visitor to your website to be able to place an order unless they are an approved account holder, member of community etc. Giving people a password that they are supposed to remember is not practical in my use cases -- but rejecting unregistered emails and being able to save log in credentials would be the way to go. *this allows FormNX users to monetise their forms by requiring /giving paid access