regestration set up

I am a very new user so I apologize in advance for needing very rudimentary instruction. I have installed TML, and opened my website on a separate browser. I can’t log in through the log in page and I don’t see a place for users to register. I’d like to set it up so that all users can log in with a single UN password combo. I appreciate any guidance. Thanks

https://ww.wp.xz.cn/plugins/theme-my-login/