How to log into CUS layer

Anyone have a resource that shows how to use the Dynamics AX Configuration Utility to change the layer when logging into AX? I found this…

Instructions are straight-forward but I think I need a primer which goes into a little more depth. Thanks in advance.

Go to Start menu (Windows 7) and search for “dynamics”.

This should return 3options:-

Microsoft Dynamics AX 2009
Microsoft Dynamics AX 2009 Configuration
Microsoft Dynamics AX 2009 Debugger

Choose the “Configuration”
Go to “Developer” tab.
Here you will find ‘Application Object Layer to open’ - open the drop down list and choose CUS.
Apply and OK then open the client.