how to change the display picture.

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I maybe sounding a bit naive, but I am not able to find an option to change my diplay picture here in my lot. I tried to search, but I found only option to add and delete photographs. Is it that we are bound with the pic we have selected when we first logged in to mylot? If there is some way please let me know the navigation details to that page, because I am lost searching for that feature here. Thanks in advance.