Do you have an .apk file ready?
If not, you go into an AI2 Project and use the Build option to save an .apk file to the hard drive of whatever computer you use to access the AI2 web site.
Depending on the emulator, you can either
- Follow the emulator's dialog to import (upload) an .apk file from wherever you left the .apk file, or
- Start the emulator, and when it's home screen is visible, go into your computer's file manager and drag the .apk file onto the emulator's home screen.