How to log in with Gmail

I am trying to register to log in with gmail instead of a username and password, but I can't seem to figure out how to do it. Is it possible?

Unfortunately, you cannot register to log in with Gmail instead.

Yes, you can! You can register to log in with your Gmail account by following these steps:

Go to the website or app that you want to use.
Find the “Sign in with Google” button. This will likely be located near the other login options on the page.
Click the “Sign in with Google” button.
Enter your Gmail address.
Click “Next”.
Enter your Gmail password.
Click “Sign in”.

You should now be logged in with your Gmail account!