Well, I managed to find the solution.
I just saved the config_example.php as config.php and edited it, uploaded to the server and, viola, the installation continued successfully!

Hello, I wanted to try Admidio and started the installation process, however I got stuck rather quick, my webhost(and mysql provider) automatically(and I can not change this) creates the username for the mysql in a format username@servernr , and when running the Admidio installation, the input form ...