Hard Wiring a Radar Detector

So i got the kit to hard wire my radar detector to the battery, but i have no idea how to get it from battery to the Unit, i spent 30min on it yesterday, but then i had to head off to work, so i didn't get it figured out. The firewall on this car is kinda hard to figure out. If anyone has any input on how to solve this problem, please post.
Thanks in Advance