May L.

I got the instructions on how to do the edit online from their customer service. Hence it has to be done within an hour after the order was placed:

Log into Amway.com and go to the Account Menu, where it says, "Hi, Your account", then click on Order History. Select the Order > View / Modify Order Details. "Modify" will disappear when the hour is up. Make your edit, then select "update" to finalize the order, then select the Retry Authorization Button.

(Note: You can edit anything (order setup, delivery details, payment type, coupon). The order will update automatically & new totals will be at the top. Only the primary applicant I/C and I/C who owns the credit card (unless it's shared with the account) can edit the order. If another I/C tries, the View/Modify details button will not appear.)