Once you are in Photobucket & your picture is uploaded to your Photobucket
account, pass your cursor over the picture of your choice(siggy), then click on
"share media". Then click on "links". You'll see an "IMG code" at the bottom, click
on it, it will automatically copy the code.
Then go to Chi People forum, click on "Private Messages"(on the right side of the
screen). Click on "edit signature"(on the left side of the screen). You'll see a
text box, same kind you use to post replies to threads. Put your cursor into that
box, right click your mouse, click "paste". Then finally click "save signature".
Hope that helps. Let me know if you have questions.