There are multiple ways a credit can be entered. 
    1. In Accounts Receivable navigate to Records > Credits
    2. Click Add a New Credit
    3. Enter or search for the Client Name in the Credit for field
    4. Select the appropriate Category and Product/Description
    5. Enter the remaining relevant information such as quantity and price
    6. Click Save and Close

    OR
    1. In Accounts Receivable navigate to Records > Clients
    2. Click Open a Client and choose the client or open a recent used Client
    3. Click on the Activity tab of the client record
    4. Click the small drop down arrow between New and Open, and choose New Credit
    5. Select the appropriate Category and Product/Description
    6. Enter the remaining relevant information such as quantity and price
    7. Click Save and Close