In order to launch a printing test you have to follow these steps:
1. Access to your application and go to settings (located on the top at the right part of the screen).
2. Now access to the printers sections. You will now see which printers are now connected or detected.
3. Keep in mind that you can do a printing test only when the printer is connected. If it it's only detected, you need to link it to your Tiller, here you have the instructions about ?? how to connect the printer to the iPad.
4. Finally, after the printers are all connected, you can launch a printing test. If it works it will print out a small paper indicating which role is assign to your printer.