Plug the bind plug in, power up the RX, lights blink, Hold the bind switch in on the TX and turn on the TX. Lights blink and then go solid, BOUND, release the bind switch, turn everything off and remove the bind plug. Re do after setup and after Final trim flight to set failsafe. Same way to bind all Spectrum receivers, some of the 9channel are different.
Its all explaned in the manual that came with the radio, If not it starts on page 18 [link=http://www.modelflight.com.au/manuals/pdf/spektrum_dsm/spektrum_dx7_z.pdf]HERE[/link]

Cheers