When the player touches the screen, create an object at the location:
X: floor(TouchX / (LayoutWidth / 6)) * (LayoutWidth / 6)
Y: floor(TouchY / (LayoutHeight / 6)) * (LayoutHeight / 6)
I don't have access to C2 right now, so I'm unsure of the exact expression names, but this is the general method.
EDIT: For the record, this presupposes a sprite with the origin in the top left.