To install Broville for PC: Go to Run and put in "%appdata%\.minecraft\saves". In the folder that is opened, extract the zip into the folder. Make sure you backup your World2 BEFORE you install Broville as it is in the World2 slot.
TO install Broville for Mac: Command F "minecraft" then you'll need to open the minecraft folder that's under application support, and then you'll find the saves. (Don't blame me if this is wrong I don't have a Mac).
I've also been told that the save files are located in Library>Application Support>Minecraft>Saves if the first method doesn't work.
Any questions, comments, complains, trolling, etc, email me oldshoesbro@gmail.com! Check out my tumblr page for Broville updates and other shit oldshoes.tumblr.com!