Go to the Schedule view in Heja
Click the three dots in the upper right hand corner once you are there
Then, click "Subscribe to team schedule" and copy the calendar link
From your phone, paste this link 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.