can’t access admin or dashboard or login credentials.

I tried changing my connections’ security by adding s to the URL but some error occurred and so I removed it again but since then I can’t access my dashboard or my admin registration page. it keeps saying not secure and not valid response. I tried logging in through www.remarpro.com but it keeps saying wrong username. what should I do?

The page I need help with: [log in to see the link]