exactly^^^
But let me re-explain it in case it wasnt understood.

Go to a website were you can share pic's. post your pic on the site.
Take the url addrese to the pic. Go to your user cp.
Go to edit sig.'
type the adresse to your pic in the appropriate place.
once you have type it .add [ IMG] [/ IMG]
on each end
i.e
[ IMG]httpthisishowtodoit.com[/ IMG]

then your pic should appear in the sig...

my bad if this has allready been sorted.....

pz