Why Can T I Sign Into Gmail

How do I get (pick up) my Gmail? It just keeps going right back to Add Gmail to your Account . . .

I already have a Gmail account, I don’t need and I don’t want another account, I don’t want to “link” anything else, I just want to sign in to the one I have.

There seems to be no contact information to ask Google this as well. You can see what I mean as well if you just type in my question on the internet.

So, please, help and many thanks.