Commands are the feature that allows you to play a prerecorded message to your dog and it is currently available on all supported Android and iOS devices. (macOS device used as a dog station doesn't support commands feature)
You can add a new command on the Dog Station before the Person Station makes a connection. You can find the Commands option in the menu ( Menu -> Commands). In the Commands screen, you can add a new command by tapping on the “+” icon.
In the Commands screen, you can also edit and delete already existing commands by tapping on three dots on the side of each command.