Remove an app

I want to remove an app from my MacBook.
If I select the relevant app in the list of all apps and then click the ‘Remove’ button, absolutely nothing happens.

Follow the steps here:

Thanks for this link but there is an option in CCleaner that doesn’t work in my case.
I’d like to let CCleaner remove the apps I select.

Sadly, there are several things that don’t work, that being one of them.