In this video tutorial, the instructor demonstrates how to add the action to the 'Login' button in a login form. The instructor goes back to the code and adds the necessary code in the 'Login.cshtml.cs' page. The instructor uses dependency injection to manage an instance of 'SignInManager'. By intercepting the data sent by the 'Login' form, the instructor processes it using the 'OnPost' handler. The instructor checks the data validity using 'ModelState.IsValid' and authenticates the user using the 'PasswordSignInAsync' function. The 'RememberMe' option is used to control the authentication cookie's storage. If the authentication is successful, the user is redirected to the 'Index' page; otherwise, an error is added to 'ModelState'. The instructor runs the project and tests the 'Login' functionality by adding a user and checking the login process.
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