Hi Tom...
maybe there's a better method for adding it to your sig....but
First you need to copy it to your gallery...I'm not sure you can do this direct while on site.
So if its not possible copy the image on to your desk top and add it to your gallery from there in the normal way.
Then click and enlarge it while still in your gallery.
Next open a new window and go to site, click on the personal details/settings icon. This will open up the long list of name, address avatar etc.
Towards the bottom you'll find the signature field.
Go back to the enlarged image in your gallery.
Click on the image and hold and drag it over the personal details window.
If its working, the image will come up in a load of white space.
Now copy all the text in the Address http:// window and click on back to return to the detail page.
Then just paste the address line in to the sig banner field. Save changes and Bob's your Uncle.
If you have any probs let me know and we'll try to work it out.
Glad you like it.
Cheers
Peter

:-)