You will need to upload your picture to an online host. If you don't already have an account, at say photobucket.com or tinypic.com (I think thats the URL) you can try one of the above, or I reccommend sitesled.com.
Once you get an account, you simply upload the file unto your online hosting site. This will give it a URL that will allow you to share it with darn near everyone!
Go into your huntchat.com account where you can edit your signature and paste the URL into your signature box. You need to put the image tags around it, which are simply [img] with the last image tag having a backslash between the bracket and the img (to close the URL that the board will open and display as an image).
Clear as mud? My job here is done
Alternatively, I could probably host the image for you, but Im sure once you share one picture... you will have to show us all of them. I know you got some good ones