The title thing confused me for a bit too. You can only change it when you go into Advanced Editing in case you have need of it later. It'll be at the top. As for how to put sprites up, here is the website that Expert Evan recommended in the Rules sticky. To use them, right click on the sprite you want and click Copy Image Location. Now go to your thread and select where you want the image to be. Click the little picture icon with the mountain in the editor toolbar, paste what you just copied, and hit Enter. Ta-Da!! Good luck with the thread. =)
EDIT: ninja'd