Daniel333, this is *not* the place for such questions. But because you are a newb, I will quickly answer it for you before closing it down.
1. see where you have written "Theres the traitor get Kyle Katarn" ? Thats your sig area, it is accesible in your user cp.
2. Seeing you know where that area is(as youve written in it) all you need to do is post an image in it. As DD has indicated this is done via the [img] tags, which are placed around the URL of wherever you have your images uploaded. There are numerous places you can upload your images for free, like uploadit, but if you plan on doing alot of image hosting(as I do) having a little account gives you much more bandwidth.
4. Check out that thread, and ask further questions in there.
Asinus asinum fricat