You should be automatically prompted to add the calendar subscription to your calendar application.

If you are not automatically prompted then try clicking here.

If that doesn't work, you can manually subscribe to the calendar with the appropriate instructions and URL for your platform:

Calendar Subscription URL (Webcal):
webcal://jordanbpeterson.community/calendar.ics
Calendar Subscription URL (HTTPS):
https://jordanbpeterson.community/calendar.ics