Type the name of the frag in question into the search box on the top right of the website and hit 'enter.' If you're lucky, the frag will be in the database and its note pyramid will be broken down in the fragrance's description, or you will get a list of notes. If no notes are listed, you can check out reviews for an indication of the notes. You could also try fragrantica.com
It would also be in your interest to post the name of what you are looking for. There's plenty of experts around, and they could probably help in zeroing in on good alternatives for you.