If you are very new to this, it might be a good idea to familiarize yourself with your device here:
http://forums.crackberry.com/f34/welcome-read-first-12/
To get the newest O/S for your device from your specific carrier, go here:
BlackBerry - BlackBerry Desktop and Device Software Download Sites
This would be the easiest way to update.
To get the newest available O/S software, which may be from another carrier, go here:
http://forums.crackberry.com/f52/new...ficial-296697/
There are some extra steps required with this method, so remember to follow the instructions in the very first post.
Posted from my CrackBerry at wapforums.crackberry.com