New to the game and already lost :D trying to figure out what i need to make car push button work like i want

The LED should be the smallest problem… i already know which pin it is an made a simple code and connected it directly to the board and i can turn it on an off using a separate switch that came with the arduino kit. (See picture, sorry i know its messy). What i struggle with is picking up the signal from the button on the board not from a separate switch that i asembled.