你 need to look in your inventory and there will be a deed in their. 你 just click on it and your other horse will leave then whistle for your horse then the Kentucky saddler will come.
Go to the inventory and select the "Kentucky Saddler" deed. When 你 press it it will come up and say "You got a new horse" 或者 something (I haven't played in a while) and 你 whistle, then your 骏马 will come to your side, ready to serve you.
