How do I set the billing or shipping address to a different one than I used for registering?

On the cart page, in the address section, select the change address option. The drop list will contain all the addresses on file for you.

You can enter a new address in the checkout process. After the cart review, you will be directed to review the default Billing and Shipping addresses associated with the order in your cart. Once prompted to update your address, choose Billing or Shipping, then click the "New Address" button. Please note that when you enter a new address, your account must be re-validated by Beckman Coulter customer service prior to processing your order.