The best way to start getting around the forum in my opinion to make a whole topic about YOU!
Just post some things that you think are interesting about you and what you like and maybe members of the community will nicely greet you back. If you cant think of how to start off then here is some advice that I will give you.
To begin you might want to start by giving your name, how you found the forum and do you think you would be an active member here. Next you can start by giving your interest and activities such as what games you play, what sports do you play/like, music genre you like, ext. Now you can just write whatever you want from there on if you want.