Price, only for registered users?

Hello,

I want to hide price for unregistered users. I using CART66 plugin

if(CART66_PRO && $p->is_paypal_subscription == 1) {
            $sub = new Cart66PayPalSubscription($p->id);
            $subPrice = strip_tags($sub->getPriceDescription($sub->offerTrial > 0, '(trial)'));
            $prices[] = htmlspecialchars($subPrice);
            $optionClasses .= " subscriptionProduct ";
            //Cart66Common::log('[' . basename(__FILE__) . ' - line ' . __LINE__ . "] subscription price in dialog: $subPrice");
          }
          else {
            $priceDescription = __('Price:', 'cart66') . ' ' . Cart66Common::currency($p->price);
            if($p->price_description != null) {
              $priceDescription = $p->price_description;
            }

            $prices[] = htmlspecialchars(strip_tags($priceDescription));
          }

What i must change?

http://wordpress.org/extend/plugins/cart66-lite/