Casio V-REGI Series Reference Manual page 16

 I will tap in the upper left corner of the customer code input dialog [+].
 Customer code is issued automatically, go to the registration
confirmation screen.
 A subsequent operation is the same as the registration of new
customers.
[4] If you want to select from the entire customer list
Select from a list of customer book.
 In a state of displaying customer code input dialog, I will tap the <OK>
without entering the customer code.
 Customer list is displayed. Tap the list display area on the left side,
customer information of the target appears on the right side, and then
tap <OK>.
 Tap the <Cancel> If you want to stop the operation.
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