The basic idea here is to make a character then join with a few others and a GM(Game Master) to tell a story here's how it works:
THe very first thing you should do is get someone to help you make a character (I think Eets is helping you). Once you have a character wait for someone to announce they're starting a new game then ask if you can join. Once you get in a game your job is to act as your character. The GM will give you an opening then you post what your character does. This can be practically anything from blasting some guys head off to running away and hiding. Just remember that whatever you try may not be succesful, an example would be if you say *your character's name* shoots at the farthest droid on the left you cannot be sure you hit the droid until the GM confirms that you did (or didn't).
Ok this probably sounds very confusing so if you have any questions ask whoever's making your character.
Oh and if you like this I reccomend joining the Star Wars RPG site at http://swrpg.netfirms.com