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I'm not much of a computer wiz so can't help you much on this. There's an entire forum that's for nothing but "User Gallery" questions, how too's and problem solving. Look through that gallery and you should find the answer.
I just put them in the gallery, that takes little brains to do, and it gives the little pic in the corner of your posts. Just go to the user gallerys, and there is a button in the top corner of the block that says "create/edit" your gallery, and just fill in the blanks till you find what you need.