Personally speaking, I don't like the look of the system, mainly because of the ad popup, and partly due to the two lines on the link you gave:
Fusion News 1.0 Beta
Most commonly used across any websites at the moment
(My emphasis, by the way).
It seems a bit of a contradiction that a Content Management System (which, by the way, is the other common name given to this type of script) is "the most commonly used" and yet is still at beta 1. Hmm.
Anyway, they have lied. The most commonly used CMS is PHPNuke, an open source (and ad free) system brought to you by the same folks who did the phpBB forum software... I think. Anyway, I had a mess about with PHPNuke a while back and found it was pretty easy to get up and running and not too difficult to customise either. It also has pretty decent documentation and has a large community to help.
www.phpnuke.orgIn general though, you'll need a few things. Firstly, you'll need a server and the software (personally, I'd prefer a Linux box running Apache Server - it'd be easier for the next two bits and a bit cheaper, but it's down to you). I presume you have this, as I see you have your own site.
Next, you'll need an interpreter for whichever language you are using for thr CMS, in this case PHP. If you have your own server, you'll need to download it from
www.php.net and set it up according to the instructions. It will almost certainly involve text-editing a few files, but I think you should be okay at that, yes?
If you rent a server from another company and don't have access to it, things can go a bit wrong here. If you don't already have PHP installed, you'll need to get them to install it for you, and this almost always costs you extra. Quite often, you'll need to upgrade to one of the resellers other package deals.
Thirdly, you'll need a database. Most CMS's are built around the open-source MySQL, which admittedly isn't the most user-friendly of beasts (it's based on a command line like in DOS) but at least it's free. If you have PHP installed on your (rented) server, chances are you'll have a MySQL database as well. However, most CMS's will let you choose what type of database you want to use, so as long as you have one, you should be fine. Again, either install it on your own server (
www.mysql.org) or get your sysadmin to do it.
From there on in, it's a case of following the instructions, which can vary wildly from system to system. I can't really give you any specific help on this system because I'm not familiar with it, but don't hesitate to post back.
