The channels correspond to the Injector outputs, so if you select 6 it will correspond to the value in Injector Outputs 6.
So if you set things as here:
(Note that the Dual Solenoid option is enabled - you'll need this for the twin solenoid coil).
The Idle controller will use the channel set at Injector output 6 here:
Which in this case is channel 64 which if you check your pinouts you'll see is EC36-pin6
Because Dual Solenoid is enabled it will by default use the channel defined in Injector output 7, which is set as 128 and corresponds to EC36-pin17.