You Already Have This Item In Your Cart... You May Not Add It To The Same Cart...
If You Wish To Increase The Quantity of This Product In Your Cart, Then...
Options A:
1. Go To Your Shopping Cart;
2. Remove The Product From Your Shopping Cart;
3. Pick The Same Product From The Products Page;
4. Indicate The Quantity You Wish Using The Quantity Input Field;
5. Voila!;