General steps would be:
- plug it in
- install supplied drivers
- start config app
- edit capture source
- set Channel Changer setting to 'USB-UIRT'
- hit the Channel Changer settings button
- hit 'new' and follow the prompts to learn the remote you need to emulate. This will involve placing the remote a couple of inches from the front of the USB-UIRT, and pressing the buttons 0 - 9 until each button has been learnt.
- give the device a name
- Ok out of the config app.
It should now change channels for you. You'll also see the red light flash on the USB-UIRT each time it transmits.