You can use Application Administration to load applications.
Application Administration is an optionally-installable component of iSeries™ Navigator, the graphical user interface (GUI) for the system. Application Administration allows system administrators to control the functions or applications available to users and groups on a specific server. This includes controlling the functions available to users that access their server through clients. It is important to note here, that if you access the server from a Windows® client, the server user and not the Windows user determines which functions are available for administration.
After you load your applications, you can Set up user groups.
The Application administration has additional information on applications.