I am confuse how to register joomla?
14 Jan 12
Have you ever tried Wordpress? (the .org one, not .com one) It would work similar with that. You need a webserver to run those. If you already have a website, you can install it right away. But if you don't have one, you still can use it locally by using the help of XAMPP. XAMPP - kind of local virtual webserver in your own PC. Try to Googling about XAMPP to know it more.
13 Jan 12
Joomla doesn't need to be registered. What it DOES need is a working web server with (I believe) php and a bunch of other stuff accessible. The requirements are in the docs. If you're trying to install it like a standard Windows/Mac program, you won't be able to: you need a web server (local or somewhere else).