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Jerko,
As was suggested, there are web hosts that offer XOOPS preinstalled. However, if you have (or are getting) a web host that has PHP and MySQL, you should not have trouble installing Xoops. It is one of the easier ones to install.
Tell me which of these steps you are unable to do, maybe we can help:
1. download XOOPS to your computer
2. decompress (unzip) the XOOPS package
3. use FTP to upload the files to your web host
4. create a user account for your MySQL database
5. point your web browser to the XOOPS install page at your site
That's it. However, if that stuff seems complicated, you can find a host that has already done that for you.
I hope that helps.