Do yo mean the "dot" in the lower left corner, under the "join date" and number of posts you made?
If so, the dot is red because of the privacy setting you have. You are online but have it set to "stealth" mode so no one knows you're online. Just go in your User CP (control panel) and change the settings. Then it will be green, like everyone else who has remained visible
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.