Im at work now so its a little more difficult to go into it all detailed with links. But have you used an ftp software before? If not, I have a page that will go thru it in detail. I can edit this to get the page for yea.
Install Cstrike addon
were in the middle of moving the site so its not so pretty, but you should understand it be able to update, just follow the instructions and let me know what else you may need, if u dont understand.