1. Turn off your printer.

2. Insert a pin or similar tool into the reset hole on the back of the printer. Keep it pressed.

3. Turn the printer back on. Do not remove the pin from the reset hole.

4. When the Ready light starts blinking, release the pin.

5. Your printer will be reset and you will now see it as a device in your WLAN list.

You can now reconnect your Star TSP100 WLAN printer to your WLAN router using the instructions here.