How do I enter my horses in the Riding Schools??

Hiya,
I seem to find entering my horse's in riding schools is the fastest way to gain XP.. right? or is there a quicker way.. ?

I was wondering how actually do you find the page to enter your horses, the only way I can find the page is through other horses clicking "This horse is currently working in a riding school, -etc- " haaalp :3

Thank you in advance c;

Go to "stable search", and on the right side there is a "search for riding schools" button. Then, you pick a riding school, and the rest is simple!

Thank you!