Throwing the switch is the last step.
First measure the voltage the sensor is given at the ECU connector while idling and warm with a voltmeter. Then check the log file from the app and see if the ECU is seeing the same. I'd ground the unused input to avoid confusion.

Start with a simple setting and all the same target voltages, use 0.5V or whatever looks appropriate from the log.

# There are 8 possible voltage targets available 0-7
# The first number for 0 should be 0.0 and means open loop
# For simple sensors where richer is more voltage, all numbers should be positive
# For later sensors where leaner is more voltage, all numbers should be negative

MyECU Cfg O2=0.00V,0.50V,0.50V,0.50V,0.50V,0.50V,0.50V,0.50V,
# 0 = None, 1 = Inp1, 2 = Inp2, 3 = Both
MyECU Cfg O2Sensors=1


Next go to the flags section of the map and check closed loop is enabled near idle. Keep the bottom row open loop for the moment.
Flags  01  (O0)  (O4)  (O4)  (O4)  (O5)  (O5)  (O5)  (O5)  (O4)  (O4)  (O3)  (O3)  (O3)  (O3)  (O4)  (O4)
Flags  00  (O0)  (O0)  (O0)  (O0)  (O0)  (O0)  (O0)  (O0)  (O0)  (O0)  (O0)  (O0)  (O0)  (O0)  (O0)  (O0)

Lastly when idling flick the switch. As you open throttle you should see the compensation start. Come off throttle to reset compensation(bottom row).