Hi guys, I used to use my google email to login in our website. But I will not use the Gmail anymore soon or later. How could I use my email to login in? I already have changed the email address associated with my account, but I still got required to use Google to authendiate to login.

You might not have a password set on your account since it was created using the Google integration, go here to set one and see if you then can log in with email and password.