Hi. I put pictures in from hitting the insert image button above the reply screen. When you hit it you can download pictures from your pictures you have stored on your computer by hitting browse.
I'm from Adelaide. Hi from a fellow Aussie.
You can edit your 'signature' by going to your profile (just click on your username) and scrolling down. You need a few more posts first though, I think you need 10 as a minimum to make a signature. Do a bit of greeting or something, and you'll be up there in no time. :]