Can’t login |

As the title says I can’t login on to my admin dashboard.
I’m not tech-savy so I can’t figure out if it’s because of problems with the codes(?) at the top of the page or if it’s because of cookies as it says in the login-box – or all of it?? In the login-box it says that cookies are blocked because of an unexpected output (roughly translated from Danish).
I’ve tried two different browsers (firefox and microsoft edge) + clearing all cookies, site data and cache and it didn’t help.

I’ve tried installing a ftp-program via my webhost, but when I did, it deleted all my files and I had to restore them again. So I don’t dare to do that again (not without professional help if it turns out that’s needed). So I can’t login to try and disable plugins, theme etc.

What can I do?

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

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