Now you know where the gadget is enabled, let's understand how a tour is launched.

Basically a tour is launch the tour by adding ?tour=tourname in the querystring of a wiki URL. You can optionally specify the step name: ?tour=tourname&step=stepname. For instance, you could start the test tour by replacing tour=test to the URL above. Remember, to return to this tour change it to ?tour=guidedtour&step=starttour and reload the page.

Perhaps you don't see any tour in the querystring of the URL? That's because after the tour is launched, it uses a cookie to track your tour state as long as you are on the wiki. This way, it won't have to keep hacking in the above to the URL.