FREECASH sometimes has a catch to it. Go into Redeem>Freecash in points. Look at the specified FREECASH which usually tend to act like coupons. It will show you how much you need to spend before you can actually use them, when they expire, or what products they're allowed to be used on.
For your general point balance that's not freecash related, you can apply them to your order when you checkout.