If you need to update an existing Content Hook, you can do so on the Integrations page.
Warning
Any changes you make to a Content Hook that is currently being used on Displays will propagate to those screens, so be cautious when updating.
Navigate to the Integrations page
Click Edit Integration on the Content Hook you want to update

Update the desired fields

Submit
Need to use a different Auth Token?
Changing Auth Tokens on an existing Content Hook is not supported. To use a new Auth Token, you will need to create a new Content Hook to play on your Displays.