You can access the Credit Reasons page from Settings | System | Credit Reasons.
Credit Reasons can be used to report on why credits are happening in your business. Every credit that is completed can be given a reason to help;
They are used when entering credit notes, and can include suggestions such as 'faulty good' or 'change of mind'. The credit reason is recorded on the line for the item being credited or returned.
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To amend an existing Credit Reason;
Click on the link that you want to edit, and change the name by typing the new name in its place.
When completed, click Enter on your keyboard.
To delete the name from on-going selection; click the Delete icon at line level for the selected Credit Reason.