When you register, you will be asked to provide an address in your account details.
If you want to change the delivery address after you have created your account, you can do so either by going to 'my address book' in 'my account' section and add your new delivery address. Alternatively, when you get to the checkout confirmation page click on "change address" under the delivery address and select the appropriate address or add a new one.
Unfortunately we cannot change the delivery address after an order is placed and should you need to do this please contact us on 0808 124 0001.