Hi, Melanie,
To add an image to your signature, you need to have it on an image host that allows hotlinking (like imageshack.us). In your User CP, click "Edit Signature." Copy the link to the full-sized image and place it between two IMG tags like this, but without the spaces inside the brackets:
[ IMG]http://www.example.com/image.jpg[ /IMG]
then click "Save Signature" at the bottom left of the screen.
To change your user title, click "Edit Profile," scroll down to the "Custom User Title" box, enter your title (i.e., Isabeau), then click "Save Changes" at the bottom left of the screen 🙂