General :: Install Firefox (or Anything) On Fedora Core 2?

just did Red Hat Linux (Fedora Core 2) install. It's the only OC on the machine. Boots and everything seems to work just fine. Everything but the operator, that is!

I want to install FireFox and Thunderbird and AVG (free) antivirus so I first went to the Mozilla site for a download, only to discover that the best way to install is as part of a Package Manager.

Fair enough - but what is a package manager? Part of the distro? Where do I get one for these items?

UPDATE - I figured out the Package manager thing and no , FireFox is not an option, nor is Thunderbird or any antivirus.

If I can't get a package manager, the site tells me that I can install with me as the only user by downloading and typing in a couple of commands (Unzip and run, I think). But I get a report that I need a something or other file (library?) for it to run. How do I find that file and why would I be the only user? Surely as root I can set it up for all users can't I?

I guess the short(er) question is: How does a new user download and install a program onto a new setup without a package manager?

Question 2 - this install is for a class and the instructor wants screen prints as proof I'm doing certain operations. How do I get a screen print of, say, a history listing and can I save the screen print or view into a file for submission?