From the point of sale:


Once in the Sales tab, click the Clients button in the menu bar.


If that button is not enabled, click the Options button.


Click the Customers button. The Customer options menu will appear. 


Click the Add New button. 


Fill out all the required information.


Click Save Settings at the bottom. 


The new client will be added to the database.



From the back-end:


Click the Clients tab at the top.


Click Add User.


Fill out all the required information.


Click Save Settings at the bottom.