The information in the footer of cover pages is pulled from the Company Details that can be found by navigating to Menu > Portal > Portal Settings > Account Settings.
If you wish to make any changes to the details in the footer information, you would need to update the information reflected in the Account Settings. Once you have made the changes and clicked the green "Save" button, the changes will be applied to all documents created in the future.
In order to apply the changes to a current document you will need to contact a member of the NowInfinity Customer Service team on either 1300 851 057 (Option 2) or info@nowinfinity.com.au, who will be able to refresh the information ready for you to send to the client.