Oops. Looks like I forgot to include the readme.txt file in the packages. I will also put the installation instructions on the web page.
But yes, you put it in the wp-admin directory. I would recommend renaming your current edit-pages.php file to something like edit-pages.php.original in case you want to revert back to it sometime. (Like when upgrading.) If you’ve already replaced the orignal file, fear not, you can just download wordpress again and take it out of there.