Chamberlain 41A5483B

There are 4 potential ports for me to inset the wires from garadget into the chamberlain lift master garage door opener. Cant find a diagram that tells me what each port is for. Any advice? Thanks in advance for the help.
http://www.ensemblerestaurant.com/39-remarkable-liftmaster-garage-door-opener-pictures-ideas/remarkable-liftmaster-garage-door-opener-pictures-ideas-wiring-diagram-for-with-overhead-ford-services-stylish-free-image-amp/

It’s the two on the left like in this post.