If you don't have a server of your own to put the image on and then point to:
go to your UserCP / edit signature
click in the box to put the cursor where you want the image
now, look for the button that looks like a yellow sky with grey mountains and click it (it's the "insert image" button)
in the spot that pops up, type this....
ht-tp://64.78.40.57/rkw/sos-contributor.jpg
...but without that dash between the 'Ts' at the beginning
click ok and save your sig. That should do it.
PS -- if you like, while you're in the sig-editor, hilight the image itself, click on the globe (insert link) button, and put in www dot storiesofstrength dot com to make the image a clickable link to the site.