If the horse has not already been imported from the entry system it can be added manually. This is done by going to People, choose the rider, press the tab horses and in the submenu choose new horse.
Change of horse
If the horse is not already within the show, follow the instruction above.
Go to start list, press the name of the horse you want to change, write the first letters of the name of the horse and the system will suggest the horses that are matching.
You can also press the small down arrow when you've marked the horse. Then you will see and can choose from all horses the rider has within the show.