The U1C and U1D pin numbers in the schematic are right. Just follow the pin numbers. It's just the symbols (+) and (-) in the op-amp (U1C and U1D) schematic that are swapped, but it's just the symbol. As I said if you follow the NUMBERS it's gonna work.

For the IC power section use the pin 4 for positive voltage (+9V) and pin 11 for the negative voltage (-9V).

Threshold resistor R5 (10K) one side (leg) connects to pin 6 (U1A), pin 9 (U1B) and one side (leg) of R6 (7.5K). The other side (leg) of R5 is going to Gnd symbol and will give you around 5.1V of threshold. Any voltage above this value will set the comparator to +9V and under will set to -9V. If you swap the R5 side (leg that's going to ground) to the -9V instead the threshold value will be around 1.3V.