How to schedule a semi-monthly recurring Aero

You'll notice that you cannot select two dates for a Master Aero that has a monthly renewal pattern. But you can schedule a semi-monthly task with one Master Aero. Here's how:

1. Create a Recurring Aero as usual
2. When you get to the Occurrence Options part, choose Monthly for the Renewal Pattern. 
3. In the Start Date field, choose the first date of the month the task occurs on (for example the 5th)
4. Choose either an End Date or a Number of Dates
5. Check the box if you always want the task to start on the same date of every month (like the 5th) or the same day-and-week (like the first Wednesday of the month)
6. Click Insert Occurrences
   
7. Now choose the second date of the month for the semi-monthly task (for example the 20th) in the Start Date field
8. Repeat step 4-6