Hi I'm trying to build a small electric cart using parts from an old power chair,but I'm stuck at how to wire the power control module. What I mean is where and how to wire in the throttle wires to the power module.

You didn't get all the parts, Google a schematic for it, or if you know where another is, you will want to see what else is connected, like Safeties , May have to jumper some connections.
Throttle may be a Potentiometer and needs to be Rated for the wattage, and correct resistance, linear taper. Maybe a 5 K pot, and control is centered(Pot is also midway), pulling right lever may go forward, pulling left lever may go in reverse. Battery and Motor connections as well as the charging point, should be a no brainer, come back if you need more.
Bet you will look next time. Good Luck

https://dynamiccontrols.com/sites/de...%20Iss%207.pdf