how do I create a credit to post a refund to
Do you have a purchase invoice relating to the credit note, such as the original invoice?
Not an exact match
Just need to create on to post the refund to
If the credit note is for a particular invoice, and the value is equal to, or less than the total, you can go to the invoice, select More Options >> Credit Note.
This will take you through the process relating to that. For example, if the invoice has been paid, then it will prompt you to create a bank transaction (you can safely delete any duplicates, as long as your bank balance is correct).
I hope that helps.