Domain help PLEASE: I can get into my DNS records…. How do I get my cite live again.

I noticed that my Web eight had been down so I figured out that my DNS records have not been updated for some reason I don’t know or I don’t have the username and password to my domain records so I have to enter them in manually.

And for some reason, I don’t know how to enter them in manually, so can somebody please tell me how I can get my domain live again I’m so confused and I’m kind of panicking.