Hi @dmart
Welcome back to the Auth0 Community!
In terms of adding a line to the login screen you go to the Dashboard → Branding → Universal Login → Advanced Options → Custom Text and try to make changes that will suit your needs.
Unfortunately changing the favicon via the New Universal Login is not available and AFAIK, we do not currently have any plans to support setting the favicon via the Dashboard. If you need to set a custom favicon you can do it by Managment API → https://auth0.com/docs/customize/universal-login-pages/universal-login-page-templates and use a solution provided by on the community members from here How to define/change favicon of hosted pages?
I hope it will help you.
Thanks and have a great day!
Dawid