3-1. Activating
PMP Agent runs background and generally there is few reasons to manage it directly. However, here is the way to activate the Agent's window for your reference.
If you can see the tray icon of Agent, double-clicking is the way to activate the window.
However, if the Agent is running as a service, it is not always possible to activate the program via the tray icon. In this case, you can activate the Agent's window by running again,
C:\Program Files\PMP Agent\PMPAgent.exe
3-2. Changing properties
Once the Agent's window activated, you can change properties.

As you can see, you can change server's notes, IP address of PMP Admin, communication port number. At the bottom of window, the connection status is displayed.
After you finish changing, minimize the window.