how to on my lot

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I am quite mentally challenged when it comes to technical stuff. How the heck do I add a picture to my name. I see people with pictures there instead of a little green and white person. How to I use my pictures to add to someone's post? I saw when I uploaded them that I could make money when they were used, how does that work? I am new at this whole social site thing and am not sure what the heck I am doing.