You send the owner a message and they can reserve one for you.
Go to the boxes page of your EC and click on the small symbol to the right hand side that looks like a human head in a rider's helmet. Type in the username of the player wanting the box and click save.
You cannot reserve a sale for someone unless you have access to the private sales, then you can input their name in the reserve box and no one else can enter the sale. Auctions are open for anyone to bid. Attempting to "Reserve" an auction is against the rules.
Breeder's reserve to your equus. The mroe equus, the more breeders reserve.
It is the amount of eqqus you have.
You can buy a pass with 20% of your reserve as of your 50th day on Howrse.
Eqqus is the kind of money on Howrse, so it's the stuff that goes in your reserve.
Fines are automatically taken out of your equus reserve.
You can stable your own horse by going to equestrian center, boxes, click the reserve button next to a box, and type in your own username.
You credit your reserve by going up and clicking on the [credit by (number)] then it should come up with a page that says things about crediting your reserve
From your 50th day on Howrse, every 30 days you may buy a pass with 20% of your reserve.
You have to put your howrse in it's box for 10 hours. -Kатнячп•Fυııэя
It means have at least 8,400 equus. Sometimes your reserve can be more or less than what you really have!
It is the highest box in the ec for the horse to stay in.