Go to the Schedule view in Heja
Click the icon in the upper right hand corner of your screen
Click "Subscribe to team schedule" and copy the calendar link
Once you see the link pop up, paste that into an email to yourself. For this next part you need to be near a desktop computer:
Go to Google Calendar --> Press the + next to something like "Add a friends calendar" --> In the popup menu choose "From URL" --> paste the link --> Save.