If your rig came prewired you will need a lightbar switch the cable that runs through the roof down the driver's A-pillar and some nutzerts. Google "Renegade lightbar pdf" and have a look at the installation manual.
To see if your rig came prewired, remove a slice of the rim next to the steering wheel, right where the switch should be fitted and see if there is a harness clipped on it. Alternatively you can unscrew the driver's A-pillar using a 5,5 millimeter deep socket and look for the harness plug right at the bottom.