Within a Client record you have the ability to capture Credit data. Proceed in doing so as you have been instructed by your organisation.
Click Clients > locate the Client record > Click the Client Name > Click the Administration tab
Complete the fields as required.
Your specific view of this page may be different than what's pictured, as your organisation might have chosen to hide or lock some of these fields. The fields with the key icon next to them are most commonly non-visible to the non-admin user.
Click Save & Close when you are finished.