If you simply want to update your address for next time, you can do this from the "Account" section. 

Click on "View addresses". You can either edit a current address, delete an address or, add a new one.

If you want to change the delivery address for an order that has already been placed, then it is best to contact us by either calling on 020 8089 9670 or by emailing customercare@medicanimal.com.