Q: How can I put ordinal dates in calendar. Ex. I want to be reminded of a meeting the 3rd Wednesday of every month

I use an iMac, ipod and ipad. The latest version of software is running on all devices. In the Calendar application I would like to know how to add events using ordinal criteria. That is, I have a recurring meeting appointment every 3rd Wednesday of the month. How would I add this to the calendar? Right now I can only do this by going to every month and putting in the date manually.