On Howrse how do you get your own equestrian center?

you need to be over 20 days old to own your own EQ... i am called horse.horse hope this helps sooo much...
Before you can make an Equestrian Center (EC for short) you must have 20 days seniority. Then, mouse over Equestrian Center on the top part of the screen, and click Office.

Then it walks you through each step.