When you add a new responder, you have to set the channel as well as the responder number.
1. Turn the responder on
2. Press both black arrows simultaneously.
3. Press the plus button.
That should bring up the screen to change the channel:
Check the circular tag on your bag of responders to see what channel they are set to. Enter that number and then press the “enter” button on the responder. (Right blue/white arrow)
That should bring up the clicker number screen:
1. Enter the number you wish that responder to be.
2. The responder will then power itself off