I have nothing appear on my home screen:

To change which part of the system you're controlling, use the navigation bar at the bottom of the page:

If you're only going to be using one tablet for the activation, you'll want to turn on Single App Mode in order to streamline your experience. Click on "Settings" in the navigation bar.

This will bring up a new page and you tap on the Single / Multi mode buttons to make the swap, which are then highlighted in red:

There is no need to click save as it is done already or you.