What part are you having difficulty with... ?? Are your instructions complete... ??
I see that on page seven (7) that you need to describe what ignition that you are going to use to determine which wiring option would be correct. Are you using a stock or aftermarket ignition system... ??
Thus far... wire 920, pink (14ga) goes to the ballast and then to the coil. Or... you can run off of the "I" terminal of the starter solenoid to the coil.
Painless Wiring 30003 instructions
Also... if you dont own the GM manuals (Assembly, Fisher Body... etc) swing by the Library with a hand full of change. You can make copies of the OE wiring diagrams for next to nothing. It will give your terminal numbers for break out and OE color codes for the original wiring.