If you are trying to post an avatar, you cannot do so yet. You have to reach 100 posts before you qualify for an av.
If you are trying to attach am image to a post, then add "" before the image and "" after the image, without the quotes.
And just in case morninggirl didn't get to you yet, your title will change automatically as your post total rises. At 1,000 posts, you get to select your own title.