It's me in trouble again. I can't for the life of me work out what's gone wrong, but if I try to put a reminder in to the calendar, I get this :

You can't add or change events in the
Birthdays calendar.

Events in the Birthdays calendar come from your
contacts in contacts. To change them or add
birthdays, use contacts.

When I first got the iMac I was double clicking or right clicking and I was then able to put a reminder in.

I've been to the calendar and looked for a solution, but got nowhere.

Any ideas ?