You can change operation mode parameter values in the operation mode parameters section of the F10 dialog. There is a tab for each operation mode defined in your testplan.
You need to load your testplan before you can see and change operation mode parameters.
The operation mode parameters are defined in your testplan, so you cannot add or remove parameters here. In this dialog you only change the current values of those operation mode parameters.
You can update operation mode parameters even if if testplan is already running.
