The tour has a lot of information embedded in it and therefore is best viewed on a larger screen. If you are on your phone, please try again from a laptop or desktop computer.
Most modern browsers have pop up blockers built in which should not affect the tour. The tour does however use overlay windows that might not show up if you have installed browser extensions that prevent ads or block cookies. Please turn these off before clicking the tour button.
Once you click the button you should see a screen that looks like the one below.