I am new to using Raspberry Pi and Retropie. I recently built my own arcade cabinet and need some help with how to set up the controls. I am using the joystick and 30mm buttons (white) shown in this guide and a Raspberry Pi 2 Model B with the latest version of Retropie. I have connected them appropriately to the GPIO pins and am stuck from there on. I have searched looking for answers, but it appears that there are none on the web, which is why I ended up here. If you could show me some guidance or a good walk through that would be great!