Well the number one thing is that you know where this page is.
http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&action=profile&u=20&sa=forumProfilewhich you get to by visiting profile and then forum profile information.
If you look down on that page there's a window with the text signature next to it. If you edit this with text etc, it will show up on your profile as you post on the board.
However, the 2nd thing you must take notice of is that you must use direct links to images in order to get it in your signature. Direct links goes to the source of the image itself.
for example this image that we use in the banner
Has this direct link
http://www.feral-heart.com/images/header/fhbanner1-1.jpgSo you need to use your self of the img code.
[img][/img]
and paste your link in between the img, like this
[img]http://www.feral-heart.com/images/header/fhbanner1-1.jpg[/img]
That way it will show an image instead of just the link. This works with ANY link that goes directly to an image, and it will work in the same manner if you edit your text in the signature.