How do I make an event repeat every {day, week, month, year}?
Add your event as usual. Then go to the details screen and tap on the word "None" next to the "Repeat:" option. The "Change Repeat" dialog will open. To make the event repeat every month, select "Month" in the first line of the dialog. Now choose after how many months the event is to be repeated (1 is the default here). Select the "End Date". Decide if you want to repeat the event by day (e.g. every third Thursday of every month) or by date (on the 21st of every month). Now you're all set. Tap OK to go back to the appointment's details screen and tap OK again to activate these details.