You first need to ensure that the Stratux is connected via WiFi, and then open the iFly app, and go to Menu --> Setup --> ADS/B, and see if the status is listed as "Waiting for Device," or "Connected." If it is not connecting, on the same page click Options --> Change Selected Device, then either select the specific device, or "Auto Detect."
If it is showing connected here, and you still are not seeing data on your map go to Map Mode, and make sure that "Traffic" is set to on, and that the weather services (Will show when connected to any internet, and only when in the sky with ADS-B) are set to on also.
There is also a video on this connection process at iFlyGPS.com/ADSB