I suggest browsing the flow of the installation by reading this page, then read the documentation at the start of the script, and only then start making the changes needed to install.
Grant execute permission to all users.
After the file is displayed, use the 'Save As' function of your browser to create a copy on your home system. Follow the instructions at the beginning of the script for configuring the script and related files for your site. The same caveat applies as with Unix editors. This is the executable file required for this function. This is the HTML file required for this function.