I have changed my user name from nussi to Nussi in the config file at user.user.nussi and after description, because i thought thats how to do it, but when i try to log in again, i have to type in my username and a password and no combination works.
You created a new user. Renames are not trivial and require setting the uid explicitly.Log in as root, use passwd to set a new password for the new user.
Then rename the home folder and chown all the files in it.
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Wait i think i get it now. I think i never made a password, i just used the one from setup 
So how do i change the folder name and chown all the files, i think i got the password, although i still cant log in.
mv and chown as root.
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Finally got it, i think in the end i only had to run sudo password nussi and then set a new one. THX for all the quick responses, i really learned a lot about nixos/linux today