Yup! Until your order has been dispatched it's super easy: select the order on the "my orders" page, click "Change delivery address" and make your changes.
The there is no option to change your address, that means the order has been packed and labelled and it's best to contact us in order to resolve this.
On the other hand, if your order has already been dispatched it is much more effective to rather contact the courier company directly, since they will have to update their records. Leaving us out of it may save you a lot of time.