The flat area on the Glass next to your right temple is called the touchpad. You will need it to navigate around the different screens on your Glass display.
Start & Swipe
Navigate around Glass or swipe through menu options by sliding your finger forward or backward (↔) across the touchpad.
Go Back & Cancel
To cancel or back out of certain actions, slide your finger from the top to the bottom (↕) of your touchpad.
Tap to Activate
To activate an action tap on the action pad.