Unless you've got a standard installation directory for programs like Snort, stick with the default here.
Expand the archive file into an appropriate installation directory structure.
Extract the contents of the zip file to a local installation directory (..).
If you use XAMPP, look inside the XAMPP installation directory for a subdirectory named htdocs-this is your Apache document root.
If you used the symbolic link, you need to edit the configuration file in the installation directory.