How to add registration to MVC from scratch?

Question

ASP.NET

There is a project, it's time to add registration to it, on the Internet everywhere they use a ready-made solution with the VS internet template
From here the question is how to quickly add registration to the project without creating a new database, but only by adding the necessary tables to an existing one.

Answer 1

What are you using to access the db? entity framework? If yes, what type, code first or?