Each invoice on your account is assigned to the client who is expected to pay, and includes an address for the client as seen highlighted in red below -
To edit this information, all you need to do is click on the blue Edit button on the upper right -
This will make all the fields on the top portion of the screen editable. You can update the client's address and the changes will be reflected back on that client's client profile -
You can also make changes to the invoice's Date Issued field. Please note that this is not the same as the date that displays under the Audit Trail tab of the invoice as the created date. The new Date Issued field could be set to a past or future date, and can be changed without affecting the invoice's audit trail.
Once you are done making desired changes, click on the green Save Edits button on the upper right -
Once you save the changes, the invoice will be updated to reflect the changes made -