1) Head to the Sales section

2) Find the row for the sales invoice you'd like to raise a credit note against

3) For this row, click on the "0.00" in the Credit Note column for the invoice you'd like to credit

4) Enter the details , date, reference and amount to be credited, along with the VAT rate (if VAT registered)

5) Click Save

6) You will now see a yellow pdf icon  against the sales invoice and you'll see the amount entered in the Credit Note column

7) To send the credit note, click the credit note icon to download it, then either email, or print and send the credit note to your customer.