I am solving a payments question using my financial calculator (HP10bII+), but cannot figure out how to set C/Y (number of compounds per year i.e. 2 for semi-annual compounding). There is a button for P/Y (Payments per year) but I cannot figure out how to enter C/Y.

Can someone help me? Here is a photo of the calculator if that helps: HP 10bII+ Financial Calculator | HP® Official Store