Let's check you're in the right place first.
User CP - Edit signature - scroll down to Signature picture box which is beneath the Edit signature box. In the Signature picture box, at the top in the centre, you should see Insert signature picture which is a clickable link in red. After you've selected the picture you want to insert and have the link to it showing in either option 1 or option 2, click on the red link.
This is the bit where I found I was having trouble. I can't remember if I clicked Save signature first and saw that it didn't work for the pic and then clicked the Insert picture link or maybe just clicking the red link did it for me. It was certainly trial and error. Try entering the url for your required smiley and then click the red link and check back on the forum to see if anything shows up under your signature. If not, have a mess about with clicking the Save signature thingy, then the Insert signature picture link.
I find I have something that says [S I GPIC][/ S IGPIC] up by the rest of my signature tags in the Edit box now so that must mean that it's accepted the picture. The spaces will normally be omitted - I just put them in so they'd show up properly on here otherwise the PC would see them as an instruction.
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Mother Bear 
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