1.) Click on Product you require. E.g.: If you just need 1-11 bottles of a Product, then just click on the individual price listed for 1.
2.) From shopping cart list press browser back button. Do "NOT" click "Continue Shopping".
3.) Re-enter username and password.
4.) Again just click on the next Product that you need.
5.) Change "QUANTITIES" to what you want for each of the Products on the cart.
6.) press "Recalculate"
7.) Check that number of order items are correct.
Click: Continue to checkout.