Once you select your Client from your Customers Tab of the left Menu...
In this section, you will be able to fine tune elements of your Customers Profile :
* Customer Details
* Billing & Shipping
* Customer Admins
Customer Details Tab:
This is where you will define the: Company name, Phone, Website, Groups, Currency, Language and Client's Address.
Billing & Shipping Tab:
This is where you will define the: Billing & Shipping addresses.
Customer Admins Tab:
This is where you will define your Client's Admins.