First, you should download and extract files from the template package. You can check detailed tutorials on how to extract template packages for MAC and Windows.
Uploading Template files
When you are done extracting files from the template archive, navigate to the template files directory and open themeXXX folder, where XXX is the theme number:
There you can see app, js, lib, skin folders and .htaccess and robots files:
Upload these files and folders to your Magento installation root. You can check the following tutorial on how to upload files .
Theme activation
Once theme files and folders are uploaded to server, open Admin panel of magento store and navigate to System – > Design section.
In the window appeared click Add Design Change button in the top right corner:
In the Custom design field select your newly installed theme:
