Hi RedDg,
You used to be able to but as far as I know it cannot be done anymore. As far as I know if you see pics as what appears to be a signature it is done by having a "Pre typed" bit of text in Notepad or similar which contains the "IMG tags" pointing at a file on some webspace and people just "copy/paste" from the notepad to the post. (But I could be wrong).....
TTFN
snafu
