Hi backupaccount7,

Are you trying to restyle the login screen and concrete authentication or create a new login screen and authentication from scratch (with possible changes/additions to the fields)?

If you are just looking to change styling and text, I believe this can be done by overriding the login screen and concrete authentication form.

Customize the login page:
https://www.concrete5.org/community/forums/customizing_c5/custom-log...

Customize the concrete authentication form:
https://www.concrete5.org/community/forums/customizing_c5/modifying-...

If you are looking to make additions to the concrete authentication form, you will likely need to override it, which involves changing the form and controller (or more). The other option might be creating a new authentication type.

Sadly I cant apply any of your reccomended ideas.
I simply just want to change the link, that redirects the user after he entered wrong data. I checked the controllers and the concrete/authentification/concrete folder.
I'm kinda lost