Hello OKCTUG! Here are instructions on connecting to the Tableau Server database. Before you can connect, you'll need to enable external access to the database.
I've attached my workbook from today where I demoed the custom report portal that is connected to the tableau server database to calculate views. My inspiration came from here: Tableau Zen: Customizing the Tableau Server experience (Part 1.5)
Once you have enabled external access, download this workbook and enter your server credentials and your data should populate. (I made the images in power point.)
If you have any questions, please don't hesitate to reach out! We are more than happy to help.