How do you sell shares in a stock in my portfolio?

Update: I am trying to figure out how to enter a sell in my Yahoo portfolio not at my brokerage.come on I am not that slow just old.
Update 2: Please, anyone who uses Yahoo portfolio to track their holdings. I can enter stocks I own but I cannot figure out how to enter a sale of part of those shares or as they describe them as "lots". Can anyone give me the steps in the Yahoo portfolio for selling shares?
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