You need to read and follow the instructions - WORKS GREAT.
Thanks for your contribution to Joomla Community.
Thank you for for the appreciation. We are glad that this plugin helped you.
Very easy to use and very reliable for the IN traffic.
Unfortunately, has not been updated since 2012 (still in beta). Also, no update for J3.x which we are running at this moment in our server.
I hope the developer will consider to update the extension to J3.x version. Also, will be helpful if the extension will use own DB for security and speed.
Overall - Good Extension in J2.5