Tail light

http://www.amazon.com/dp/B00EZE8QQM/ref=cm_sw_r_sms_awd_uV70wbDFA5K6R. That is the one I bought to add

Black is ground and brown is the brake light

Seems to me the black is the ground either the blue or black is the brake light/parking light or vice versa

If you're trying to wire a brake ;light, why are you looking for the parking light?
This is not quite as simple as tapping into the brake light circuit. Both lower brake lights are likely also wired as turn signals and the 3rd brake light cannot be.

I just want to tap into the parking light. Just so when my lights go on at dark this light goes on too

I found this so I thought I would just try to splice into the outer light. But I do not know which wires I need to put to what

That would be illegal

What is illegal to having an extra parking light in the middle of my tail lights

It wouldn't be a parking light. Parking lights are designed with lower intensity so not to be confused with brake lights. that would be a brake light.

So what do I need to do to make it a parking light. This is what I'm trying to do

If it's going to be behind that sign you can probably get away with it. The tail light wire is brown.

So I put the black (ground) with the black on the taillight. And do I connect the blue or white wire to the brown

That's a 2 circuit socket and you only need on. If you use that you will have to use a 2 filament bulb. The black will be ground and you will have to test the other 2 wires to see which one is the lower intensity. That bulb socket was designed for both brake and tail in one socket. You can ground the black wire to anything metal in the car.

How did you make out with this problem?