You can only do this if you're a PerformanceGuard administrator.
Ports contacted by the computers that have PerformanceGuard agents installed are automatically discovered by PerformanceGuard and saved in the backend database.
By selecting ADMINISTRATION > Port > Port List you can select which ports to monitor by adding them to the monitored port list.
It's possible to manually add new entries from the discovered ports list to the monitored ports list.

Monitored

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1. Remove from monitored: Remove the selected ports from the monitored list.
2. Port group: List of all port groups.
3. Port #: Port number.
4. Protocol: TCP or UDP.
5. Description: Name with which port will be shown in graphs, reports, etc.
6. Total requests: Total number of requests against a given port since the port was first discovered.
7. Action: Lets you rename the port. When you click the Save button next to this field, the port's description in the Description column will change.
8. Groups: Lets you view port group membership for the port in question.

Discovered

The port range and how the list should be sorted is controlled by the From, To and Sort fields.

1. Port #: Port number
2. Protocol: TCP or UDP
3. Description: Name with which port will be shown in graphs, reports, etc.
4. Total requests: Total number of requests against a given port since the port was first discovered
5. Action: Lets you rename the port. When you click the Save icon next to this field, the port's description in the Description column will change.

To move ports from the discovered to the monitored list, select the check box next to the required port, and then click the Add To Monitored button.