I couldn't find any city called Brunt in Italy, so I think that the city you have down as Brunt is actually Bronte, a town in the city of Catania.
If you need help using FamilySearch's search function, this might help:
What you need to do is click "Search" on the toolbar at the top of the FamilySearch home page, and then select "Records" on the menu that that opens. On the screen that that leads you to, you'll see a map of the world. Click over Europe on that map - that should open a menu with a list of European countries. Find Italy, and click on it. That will take you to the Italy Research page. There, you will be able to enter your grandfather's (and other ancestors') details into the search fields, including birthplace, which, of course, will be "Bronte, Catania, Italy". Click search, and see if his records come up! I hope that this helps!