Hi @Angels8,
Is this the Spells8 Forum Community Calendar? If so, I believe it is a Google Calendar application (and will only work in Google Calendar, which is attached to your Google Account).
There is an iCal link that @MeganB created ( iCal Link for Other Applications → Community Calendar iCal Link ) but I’m not sure if it is still updated/working.
Alternatively, there is also the 2026 Wiccan and Pagan Holiday Calendar. That calendar can be downloaded, printed, and kept as a ready-to-go calendar if you wish 
I hope that helps! Blessed be