Edit an Invoice
You can edit an invoice up until a payment has been made and applied to that invoice.
Steps
Open the application you want to edit the invoice for. If you don't know the application, you can find the invoice in the Billing section.
At the top of the application, select the Billing tab. If you don't see the row of tabs, make sure you're at the top of the application or select Application Review from the Application Tools menu.
Click the Edit icon for the invoice you want to make changes to.
Make the necessary changes to the invoice.
Once you've completed the changes, click Save Invoice. Or, if the invoice is still in Draft status, click Save Draft.

