Hi - welcome to our forum 
In order to add your own images to a sig, you must upload them (as you had surmised!)
To upload images or fonts.
To the right of the code window, click on the word 'File Library'. This will bring up a new window.
Across the top of the new window are some tabs. Use the Upload tab to add new images to 'your' library (other people can access your images).
Use the 'My Images' tab to review your images. The 'Code:' above each image shows the code required to insert the image into your sig.
EG: insert this code
Code:
image(file: "250px-bfbc2_truck.png", ownerid: 1525)
to use the image of the 'truck' that I uploaded.
To add the image as a background - refer to the Doco
http://forum.p-stats.com/threads/143...on-low-version
I hope that helps!
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