Using the tool is quite simple. Run the program, it will sits on your system tray. Select a text from any program or web application as usual, either by mouse or using keyboard shortcut key Ctrl+C. Then click on the Clipboard to Google tray icon or just use Ctrl+G shortcut key to open a Google search for the text from the clipboard.
However, the program open search results in Internet Explorer only. There is no option to change this. This is the main drawback of this tool. You can download Clipboard to Google from here.