Hi,
I will try to help but need a bit more information first. The cable that came with the Walkera - does it plug into the USB connector or the microphone input?
If it has a USB connector, then you need to set up the controller in windows first, then you should see your controller in the FMS controller setup. The USB version does not use SPP.
If it has a 1/8" jack for the microphone input then you need to set up SPP. You can find all of the setup information at the following link:
http://www.smartproplus.com/Make sure that you have the right type selected to match your controller - either PPM or PCM.
Good luck and let us know how you make out.
KEW