On the first page of the Edit Counter wizard, you can specify the name of the monitored computer and the counter type. The options are:

Tested Host

Defines the name or IP address of the computer to be monitored. You can click the ellipses button and browse for computers available in your local network via the Select Host dialog.
Use standard counter

Select this option to monitor one of the four predefined CPU, memory or disk usage counters.
Use custom counter

Select this option to monitor the performance of the desired application or add any custom counter that is available for the given computer.

Specify the tested computer, choose the needed counter option and click Next to proceed.

Edit Counter Wizard - Select Tested Host Page