Google: On a computer, open Google Calendar → Other calendars “+” → From URL → paste the link. (Google can take a few hours to refresh.)
Outlook: Calendar → Add calendar → Subscribe from web → paste the link. Work/school and personal Outlook accounts use different pages — try the other button if one fails.
If QGenda ever changes your link: your calendar will show a single “⚠ Schedule sync broken” event — just come back here and redo the 30-second setup.