Question 1

So do i attach the white & yellow wires together on the one side and the black to black on the other side?

Accepted Answer

No you splice the yellow light into the hot wire on your turn signal harness.  So the front yellow blinks with your turn signal and the white side light runs with the lights. Or that’s how I have mine. 
You could put both together and both lights stay on with the headlights. I’ve gotten a lot of comment and questions about mine being turn signals tho. 
It’s up to you what you want to do

Question 2

No wiring instructions included?  How to I find these?

Accepted Answer

I used test light. Ground it out. Turn on the head lights to find the hot. Ground a wire and touch one of the other 2 to the hot. Faster than looking for wiring instructions. I used black as ground, white as hot for running light and yellow for turn signal if I’m not mistaken. Been that way for almost a year with no problems.

Question 3

I have a 2016 scion fr-s in the united states. what are exact instructions for wiring this up for a 2016 scion frs in the united states ?

Accepted Answer

It's been a while since I installed one on my 2019 86 TRD that I've sold;
but I can tell this.  Google BRZ/FRS/86 install info. Don't limit yourself to this particular "brand" light assemly just google the assembly in general.
I emailed the vender that was some help. They sent a youtube link.
I searched & watched youtube videos that helped a little.
I read reviews on Amazon that had install info. Some had videos, that helped a lot.
Then I went to a friends house who messes with cars more than me;
figured out which wires on my car corresponded to the lights on the unit.
traced the wire already on my car so I knew where I was running the new one 
made the connections and drove off into the sunset.
I remember I had to splice one wire the rest worked with one of the provided  wire harnesses, I think.
That's the best I can tell you if you lived next door I'd give you a hand.

Question 4

Anyone know how to install the fog lights ?

Accepted Answer

I'm pretty sure I found a youtube video.

ASIN	B08DXXVHHC
Auto Part Position	Front Left, Front Right
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	200,819 in Automotive ( See Top 100 in Automotive ) 847 in Car Side Lights
Brand Name	NJSBYL
Colour	Smoked Lens
Compatible with Vehicle Type	2013-2020 Scion FR-S, 2013-2020 Subaru BRZ, 2013-2020 Toyota 86
Customer Reviews	4.5 4.5 out of 5 stars (150)
Is Assembly Required	No
Lens Color	Smoke
Lens Material	Polycarbonate
Light Source	LED
Manufacturer	NJSBYL
Manufacturer Part Number	NJS-170402
Model Number	Scion FR-S led side marker light
Model Year	2013
OEM Equivalent Part Number	Replace OEM Part# SU003-02540 SU003-02541 SU00302541 SC2554100 SU00302541 SC2554100
Special Features	Shockproof, Waterproof
Specific Uses For Product	Lighting
Voltage	12 Volts
Wattage	5 watts

Smoke Lens White/Amber LED Front Side Marker Light Kits for 2013-2016 Scion FR-S 2013-2020 Subaru BRZ 2017-2020 Toyota 86/GT86 Turn Signal Lights Running/Parking White/Amber LED Sidemarker Lamps

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