I'm going to assume you are on the TouchWiz Launcher, which I think is extremely likely.
The version you need to download is about half-way down the first post, under 'Special Versions' it is named 'S3 Version' Just download the .apk, and install. You will then be able to add it to your homescreen.
but its a zip file? I download and its a zip file...? where its the .apk file? or how to install the zip file because I dont know ???:crying:
please....