I know its a to much of a newbie Q, but what can I do Im new in VFP

I have a form, and what I want to do, is to add the quantity of 4 labels that the user its going to give and bya a botton have this simple operation
(label 1+label 2+label 3+label 4)/4,

the result its going to appear on a label 5, call total,

But I just cant get it to work...cna anybody help out on the code please


thanks ya'll