I most surely will my good LanCrafter. This is how you do it:
First, click your name
Briareos in this topic f.e.
This will open your LanCraft Control Panel. Too your left you should see the following sections:
Profile Info, Modify Profile and
Actions. Now go under
Modify Profile and press
Forum Profile Information here you can edit stuff like your Avatar, your personal text, birthdate, gender and of course, most importantly - Your
Signature!
Next to the Signature text you can see a box, there you'll only need to paste your signature URL in a image BBCode like this (copy and paste if you wish):
[img]http://b.imagehost.org/0425/magoogle_10.jpg[/img]
When you're done you should see your new signature image in all your posts

Hope that helped.
Now enjoy your signature!
Zarx