Open the "Invoices" tab.

Find the invoice you wish to edit, and select it.

Select the "edit" option at the top of the page

Select "Approve" or "Approve and email" when you are finished.

Open the "Invoices" tab.

Find the invoice you wish to delete, and select it.

Scroll to the bottom of the page and click on the "Delete" option.

Note:
Deleted records are added to the archive, allowing you to restore them at a later point, if needed.

If the "Delete" option is not present, this may be due to the invoice being paid. If this is the case, select "Remove All Payments". The "Delete" option will now be available.