You can edit a sensor by double clicking its entry in the sensor list. There are a number of settings that apply to all sensor types, as well as individual settings for each sensor type.
The settings are arranged on a number of pages and you can select the desired entry on the left hand side.
PRTG Traffic Grapher is an easy to use Windows software for monitoring and classifying bandwidth usage. It provides system administrators with live readings and long-term usage trends for their network devices. The most common usage is bandwidth usage monitoring, but you can also monitor many other aspects of your network like memory and CPU utilizations.