using a theme .zip file for my home screen I was looking for customize my homescreen and found  this screen attractive.
I have already downloaded the zip file given there, but don't know how to use them.

Please help.
You need to install the software the page links to in the top right: Nova Launcher and Ultimate Custom Widget. The files in the zip include a wallpaper (which you set through the launcher's settings), a theme for Nova Launcher, and settings to use with the widget. Once you've installed the right software and played with its settings, it should become obvious how you need to use the files.