The username and password to login to Tableau is the same as you use to login to your computer: first.lastname.
Please note that there is an app for Tableau and that can befound here:
https://itunes.apple.com/us/app/tableau-mobile/id434633927 . To use the app, the server address is: tableau.mcsd.org. The same username and password apply here as do through your computer.
Here are some link that should be helpful in accessing Tableau Dashboads and Views