^^Well,dear,all you've to do is right-click on the pic,tht you wanna put-up as your siggy.A box will appear,and in the end,"Properties" would be mentioned.Just click on tht,and the properties of the Siggy will appear,the link to the image wouuld also be provided.Just enter the link of the siggy,in your Sig.box(you'll find tht in your settings)...Haan,you should put the link in b/w:
[I M G] [/ I M G]
(Just minus those spaces,in b/w).
I hope tht hlps!..