Choose the historical records tab, fill in a name and an approximate date, choose Isle of Man from the drop down list of countries, and click search.
If you want to look at a particular census year, when you have reached a general results page, click on census at the top of the left hand box, and you can choose from a list which appears. You often need to click on "see more" near the bottom of the box to move to the next page of the list.
An alternative way to search by a particular area, such as Jurby, is to look at the bottom of the historical records search page, under browse by location, choose UK and Ireland, then Isle of Man.
Good luck!
Susan