My dashboard is gone

Hi there again. Just a minute ago I wrote about my problems deleting all tables in my database to reinstall WordPress. However I found some earlier posts, that may help me doing this. But then I have to login to my dashboard – right? – and I’ve been stupid enough to change something, so that when I’m going to https://www.”my_domain”.dk/wordpress/wp-login.php, then I don’t get the usual page with login-informations. I just get a white page with the login-spaces to the left. I can fill them out, but when I click OK, it says “The page cannot be found”. You can se an example her:
https://www.madssvaneborg.dk/wordpress/wp-login.php.
How can I get to my “dashboard” to change it back? I’m pretty sure, that it all went wrong when I changed the URL-adress to just “Madssvaneborg.dk” and not “Madssvaneborg.dk/worpress” in my settings…

Hope you can help! Thank you very much!!!