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To edit a customer’s credit, you will need to search the customer’s name in the search bar above the screen, then once you are on the customer’s profile, you will need to select credit history on the side column below the book now button. Once you are there, to edit the credit amount, select the price of credit that is highlighted in blue. 

You will then be able to edit the amount of credit that is issued to the customer and select the checkmark when you are done.