You'll be prompted to login after you connect to WiFi. If you're not seeing that and you're on the home screen, tap the hamburger menu you'll see "Log In" on the right side.
I don't believe there is currently a "Morley" mode in Stadium.
To your second question, Volume, Wahs, and Whammy's bypass state is automatically assigned to the toe switch. Beyond that, you can assign anything to "EXP Toe" in Bypass/Control.