Burn tool (looks like a hand with a finger rubbing the paper...lol... I'm not sure if it looks the same in PSE). Set the strength to a low number (like 5) and change the brush if needed, set it to midtones for most colors, and then brush over the edge that you want to "wrap" around your photo and build it up to your desired liking.
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-It's pronounced Meeeegan... get it RIGHT! 
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