OK, then slowly:
The dialog NOTIFIES you that TestStand cannot retrieve the parameterset for the chosen function from the DLL. This dialog should only popup when you select a new method in the step.
If you confirm the dialog, you have to MANUALLY add appropriate parameters to the DLL call to match the parameters of the DLL function. In your example, you have to add a string parameter.
Each parameter must match in data type and passing convention (call by value, call by reference) as long as applicable. A string for instance is always call by reference, so no setting necessary for this part.
Once you got the parameters configured, you can assign constants or TS variables as required.
Executing the step will create runtime errors if you failed to manually create and adapt the appropriate parameters.
Norbert
----------------------------------------------------------------------------------------------------
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.
