How can I require visitor registration to access my website?

I need to " force " the visitor to register to access the site, how do I do it?

Hi @electromm

Create a login and register popup and block the screen on page load.

I’ve never done that, can you help me?

By the way, I need to customize the form, I can do it in HTML, however the “SEND” button doesn’t send me any notification, why?