That has a “head tags” tab but I can’t figure out what I put in there to have it show up on the page? Am I on the right path or is there a better/different way?
Welcome to the Auth0 Community and sorry for the delayed response!
In order to customize a certain prompt from the Universal Login experience you will have to configure the Advanced Customizations for Universal Login (ACUL). The Customize authentication screens section in Universal Login is the specific section to set ACUL configuration.
ThIS feature is intended for cases such as yours, but you will need to create your own client-side frontend application for the desired prompt/screen and set the script to fetch the bundle assets in the head tags. You will also need to set the Rendering Mode on Advanced and configure a Custom Domain. To use ACUL, setting the head tags is mandatory, in which at least one valid script element is required to load your custom bundle. Afterwards, using ACUL you can implement a function that refreshes the login page every 60 seconds.
Another option would be to Customize Classic Login Pages, which also requires setting a custom domain, but this would not be specific to a certain prompt, but multiple pages that might integrated within the login process.