Here you can see the two wires more closely. I used duct tape on the back to keep the board from touching anything metal. Some people put the case back on and then drill a small hole for the wires. To save space I left it off.

NOTE: The best way to find out where to solder is to take a paperclip, bend it U-shaped and touch the two connecters that will open your door. Once you find the two connecters that is where you solder the wires. It's usually behind the button on the opener.