Sure thing Mike. At the moment you would have your two recievers plugged into the two RX ports on the 2018. The IGYRO SRS goes between the recievers and the 2018.
The recievers plug into the right side of the gyro, exit the left side then into the RX ports on the 2018 as normal. So you should only have two leads entering and exiting the gyro always, apart from the gps sensor if you have it. The gyro reciever setting needs to be set to 'Digital Out' from memory. Asign two channels to your TX, one on a three position switch, the other a slider or knob.
Now the 2018 should be picking up the reciever signal through the gyro, you can do the set up assistant in the gyro. As its a digital signal that needs to be picked up, the set up assistant will ask you to move the switch so it can pick up that channel, then it will ask you to move the gain slider to pick that up, and so on.
I always prefer to do the test fly assistant on the ground and set all the gains to 30% to start with, then get your spotter to turn on the gyro during your flight. If there is a problem then they can turn it off quick. If more gain is required, adjust it on the ground then repeat.
I find the method of tuning the gyro gain in the air to be crazy. They tell you to increase the gain until the plane starts to destroy itself, then back it off a little.
Ive had great success with my system but that's only my opinion mate. Do what suits you.