Hi georgehperry, thanks for your post.
Sorry to hear there's an issue with the address on your contract. As far as I'm aware it's not possible to change this online, depending on what the mistake is I'm unsure if we'd be able to help here either - as the address is verified beforehand to ensure the property is serviceable etc.
Without posting any specific details, can you let us know what the issue is with the address? If it's difficult to explain without confirming specific details feel free to send me a PM.
Tom
