XOOPS is an open-source Object-Oriented Web publishing system written in PHP. It is an ideal tool for developing small to large dynamic community websites, intra company portals, corporate portals, weblogs and much more.
XOOPS is released under the terms of the GNU General Public License (GPL) version 2 or greater, and is free to use and modify. It is free to redistribute as long as you abide by the distribution terms of the GPL.
If you are running a local environment for development or testing, make sure that you have the previous requirements met. Once this is done, copy the contents of the htdocs directory (from the XOOPS distribution file) to the root document path of your web environment. Once the files are copied there, you can start the install by pointing you browser to "http://yoursite.com". This will start the install process.
If you are running in a hosted environment, unpack the XOOPS files locally or on the server if you have shell (i.e. SSH) access. Once done, make sure to move or copy all XOOPS files from the htdocs directory to your root web directory (your provider usually provides this location with directions). Once the files are copied there, you can start the install by pointing you browser to "http://yoursite.com". This will start the install process.
Just follow step-by-step instructions in installer.