You can edit the notes on an invoice or set a default note to be applied to all invoices. To manually edit a note follow these steps.
FROM THE WEB APP
Step 1: Click to open the invoice
Step 2: Click "Add Notes"
Step 3: Enter your note and save.
FROM THE MOBILE APP
Step 1: Tap to open the invoice.
Step 2: Tap the 'Show More' button below the Invoice Details.
Step 3: Tap 'Notes' to add/edit your notes.