How do you breed your horse with your friend on howre?

Well who ever has a stallion has to offer a private covering to the other player. The person with the stallion must go to the bottom of the page where it says he's family tree and number and offsprings, casterate and coverings you click on coverings then click private then right the players name and chose a price and the players mare then send. Then the owner of the mare goes and clicks on the private coverings icon then accept.