CGM Event Calendar URL

OK, so I know i am being dumb, but i cannot figure out what i am supposed to put in the “Calendar URL” on the settings panel, and because of that, my upcoming events are messed up.

i’m using a temporary URL at https://66.147.244.214/~wctrusto/ while i build my site.

i’ve tried https://66.147.244.214/~wctrusto/calendar but that does not work.

thanks for any help.