how does this work

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I know i can read all the stuff but to much to process. I signed up so i could respond to people and help if i can. Then i find out i get paid a bit yeah thats good. I don't know how to download pictures and not very computer savy so if any one has a few moments to explain the site to me in simple terms......also i want to change my little shaded person to a differnet picture likes other do can you explaine this to thanks