I recently invested in a raspberry pi 3 to make a Lunchbox Laptop from a book I purchased. I setup the Pi with HDMI. Now I need to figure out how to use the 3.5 mm jack to output video. I have a cable for it but I can not figure out how to make a video signal to come out. I think my Pi has the HDMI port set as the default. How can I change this to the 3.5 mm jack? I have looked around on different websites but none of them work!! PLEASE HELP ME I AM NEW AT THIS AND DON'T KNOW HOW TO DO IT!Thank you!!