You can add a signature to a debit note in Moon Invoice easily by following the steps below.

1. Open the Moon Invoice application on your device or tap on this link.
2. From the main menu on your left, go to Purchases ➜ Debit Notes.
3. Click on the existing debit note, then select the Signature icon.
4. Provide your signature - or upload one - and click Done to apply the changes.