Adding external contacts

I've been using zoom to communicate with health providers for 2+ years.  I have a free account.  I'm trying to add these permanent contacts to my list along with their dedicated room id.  I'd also like the meeting schedule to show if it IS actually a zoom appt.  (they show but always as non-zoom) My health situation creates frequent confusion so this can really confuse me about where to be for appointments

I have a ton of contacts from my google account but can't star or add them to any other category.

Any feedback appreciated

Zan