My Yamaha YPT 210 is set for keys C3 to C7 instead of C2 to C6, how do I correct this?

Question

I can tell the lowest key is C3 because it shows the note where C3 would be in the bass clef (on the screen) when I press it.

Answer 1

well er um-- adjust the C3 key down one turn and turn the C6 key up one