how to use my lot?

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I am the new comer in this site. this is the first time I learn to earn and get fun at once. However it's still confusing for me because I have just started :-( I like trying to use some social sites but I think this one is more complicated. even I don't know how to put my picture as profile picture.. :-( terrible.. now I feel like I'm fool. I really need someone to assist..