Absolutely! If you've got an MandM Account, just log in and head to the 'Delivery Addresses' tab. There, you can easily update your address. Or, if you're all set to head straight to the checkout, you can also add a new delivery address right then and there.
Just remember, this step is pretty important because once you've placed your order, we start processing it right away. So, unfortunately, we won't be able to modify the delivery address once the process is underway.