Casio LK-230 Change Note Scale?

I have a Casio LK-230. I'm not an expert but I do know how to play piano and this is my first real keyboard cause I got it pretty cheap. My question is in the instruction booklet that came with my keyboard it says that I can change octaves on the board itself. Basically move middle C up an octave on the keys so that I can play lower notes on the keyboard. The instruction manual however does not explain how to do this. Does anyone know how to do this or if it's even possible. It would suck if it's not possible cause then I can't play a lot of low octave songs that I like. The instruction manual gives C2-C7 as the normal range, C3-C8 as high pitch, and C1-C6 as low pitch. I want to get to the low pitch. Thanks.

Ok, I just found a transition button. I think I figured it out!!!!! Horray my brain.