If you missed adding a rider when you first entered you can still add a person using the steps below
Go to the show you entered, then from the show menu click on .
In the drop-down, select your horse entry.
Then on the drop-down you need to select your classes. You can type the class name or number to search faster.
Then in the drop-down select your rider and click the button.
If you don't see your rider on the list, you can add a new person from the option under all the riders.