I can't add roms or get a controller to work

designalot

I installed system OS on my ROC-RK3328-CC. How do I add more ROMS to the system? I plugged in my usb flashdrive, and can see the new roms I want to add, but can't figure out how to add the roms so emulation station sees them and I can play them. Also, my controller works to navigate, but I cannot use my controller to play any installed games. I tried to go to controller configure, and try to add the up, down, left, right, start, select buttons, but I get a 4 second countdown and even though I push up, down, etc. the controls don't change. HELP!