Adding ditch lights to a DC engine

[Wheeltapper]

Hello,
I have recently bought a https://www.walthers.com/emd-gp9-phase-2-w-chopped-nose-standard-dc-norfolk-southern-2000-black-white
I want to add ditch lights to the circuit board and have bought these:
https://rapidotrains.com/products/ho-scale/rapido-bits-ho-diesel/rapido-bits-ho-operating-ho-scale-deck-mounted-ditch-lights
Can anyone please provide some guidance?