E bike throttle with key HELP

[Cam3roon2k41999]

Hi everyone. I've just purchased a throttle with a voltage metre and key ignition. I'm wanting to use the key ignition but not bothered about the voltage meter really. Does anyone know how I'd connect the wires and where they actually go? There's a 3 pin connector witch I already have on my controller but there's a blue,yellow and a white what are these for? Thanks for any help