It's important to ensure that contact details for your sites are kept up to date.
To update your contact details first login to the Wizard. If you are already logged in, click either "Back to Dashboard", or "Site Configuration" from the left menu (depending which screen you are currently at).
For the relevant site, click on the "Actions" button to the far right, then select "Contact Details"
You will now see an "Edit Site" page. Update all details as relevant and click on "Confirm Changes".