First turn on the app with the Status button, and then click on the site image to go to edit mode:
Here you can choose the rule you want to force registration:
The visitor must register - they must if they want to search listings.
Registration is optional - you can offer them incentives and ask that they register to get them.
Must register after ## searches - you set the number of searches they can do before they are required to register.
Must register after ## views - instead of counting searches, they will be required to register after a specific number of listing views.
You then give them a button with either Sign Up or Log In for button text.
When finished, those are the registration requirements that will go into action to get your leads. You can change this at any time