> I have replaced my all my similar .js and .css files with that of the > welcome app but I see no popup panel.
It may be that the old .css is cached in your browser and needs to be reloaded - try to refresh the browser page once. That was the case for me. A new button "query" should appear left of the search edit field. If you click "query" a popup panel should appear underneath, in which you can define a simple expression. You can press either AND or OR button to close the popup panel, and see the expression appear. To make more complex expressions, you need to click query again, make a second simple expression, and then concatenate it to the first one by pressing either the AND or OR button.
