changing user name and attaching photograph to my name

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i want to attach a photo to my namein mylot. I tried once but they asked to tag it and all.I did but it was uploaded for other purpose.It is still there in MyLot but not attached to my username. My friend wants to change her username in MyLot as her hubby is in mylot and comments on whatever she posts on mylot.Its gettin on her nerves and she needs help.I am unable to help as I dont have any idea. Help ASAP.