Was attempting to do the exercise on setting up a mobile application for the Sales Automation Essentials course, and was not able to find the Mobile Settings option as specified in the course. When I selected the Settings option, only got the Mobile Certificate option. See attached screen shot.
I did not go through the course in detail. But at some point there must a step to build the mobile ap. Only then you will be able to see the code. Desinger studio -> Configure -? Channels and interfaces -> Mobile. Build the app (iOS or Andriod) and you will see the QR code to scan.
In the mobile express you can type in the URL as well to see the application in mobile view.