Login - Credentials not working

I successfully installed Home Assistant in a Container on a Raspi3b. I created my account and logged in and was able to start configuring.

After restart of my PC, I was logged out and tried to log in again, but I get the info that my credentials are wrong. Did I miss something? Is the e.g. the login-username different to the one I selected?

In case I need to set a new password - how do I do it?

Best regards

/edit: Just re-installed it and re-registered again. Should be working now.