You can edit all monitor's attributes, such as list of parameters, data recording settings, alert definitions, object filters and real-time graphs at any time. If the modified monitor is running, the modifications immediately take an effect - you do not have to restart the monitor.
You should be the owner (creator) of the monitor to be able to edit it.
To edit the monitor, select it under the Monitors folder in the Object Explorer and choose Edit shortcut menu.
If the monitor is already open: