it has pins on the board for the red yellow and white analogue input. You'd have to do some wiring and a bit of soldering perhaps :)

I should go to a technical community college to learn that but now I can't do that

I was thinking more along these lines: http://www.amazon.com/RCA-Compact-RF-Modulator-CRF907R/dp/B0014KKV7W/ref=sr_1_1?ie=UTF8&qid=1434593782&sr=8-1&keywords=composite+to+coaxial

Your link you last gave was for the wrong direction (takes digital coaxial as input--the side of your N64--and puts it out as composite/RCA).

As a cool aside, the SNES, N64, and GameCube can all use the same composite cable. They have the same port.

Thanks so much :)