Yamaha Audiogram6 challenge

I just installed Cubase AI 6 and have been attempting to record my acoustic electric guitar via a Yamaha Audiogram 6 interface. Good news is that I get sound through my headphones from one of the pre-loaded instruments. Bad news is that I don’t seem to have any sound picked up from my guitar…feel like I’m missing something simple, I followed all the instructions for the bus installations… simply 1/4’’ cable from guitar to interface…

any help would be great.