Wrong e-mail?!

Created a WordPress blog today called https://www.mulighedernestid.dk. Unfortunately a friend closed the computer and now everything has disappeared – although I saved everything during working on the sites. But when I want to try all over, I can’t enter the admin now. My email address is wrong, it says!! But I have used this email all the time and received emails from WordPress etc. at this address. You can ask for a new password, but if the email is “wrong”??? I have also tried with my username, but this is also “wrong”, although I have used it earlier. Now my only possibility is to start all over: buy a new domain with a new name, install, create etc.etc?! I’m not proud of this and totally confused…

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