>Can you tell us exactly what steps you are doing and/or take a screenshot?
When you want to block a program, you have to click Allow a Program or Feature... then the Change Settings button.
If that button is disabled, you can't change settings.
Do you see a list of programs under the "Change settings" button? If so, then the settings are already enabled.
If "Change settings" was not enabled, the list below it would be grayed out.
All Change Settings seems to do for me is to enable the list. If the list is black, 'Enable settings' is greyed out. So if enabled - no need for the button!
Did you already create Windows Firewall rules? If so, then they should appear in the list already.
If you are trying to add rules, I'd use the Advanced settings instead.
I can see the settings (enabled) but the program I wanted to add wasn't listed, so I could change existing settings as if the
CS button had already been pressed, but I was unable to Add.
Hmm. My Change settings button is also grayed out, but I can click Allow another program... at the bottom. Then you select the app you want and click Add. Do you see Allow another program... or not?
Otherwise, did you try adding it via Advanced settings?