How about some info on your device?
When you press the add new engine do you see any address numbers while it searches?
Are there any engines already loaded into the device? possible ID conflict?
Is the connected TIU a version L with USB port or are you using an adapter with an older TIU?
Sounds stupid but you know the track and TIU must be powered on and not just using the WIFI cord for power, right? The light comes on the TIU only to power the processor. Not enough to do engine adds I believe.