How to integrate a demo log in feature with Auth0?

I need to make a demo log in feature where a user doesn’t have to bother with a username/password or creating an account. It will be in addition to the real log in. I initially made my own log in forms from scratch and made this form to be able to do so. Am I able to integrate this into the Auth0 form or do I need to implement Auth0 into my already existent forms?