The ink family you are working with is set on the Splash page that you see when you first access the application. It defaults to the Ultramix 7400 Series ink family.
You can return to the Splash page at any time by clicking the Home tab on the navigation bar.
Once you are on the Splash page, you can select the ink family you want to work with from the drop-down list in the middle of the page. From that point forward you will be working with the new ink family, until you change it again.