[ubuntu] Marking a thread solved

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http://ubuntuforums.org – About two weeks ago I posted a new thread asking about the differences between 32-bit Ubuntu and 64-bit Ubuntu. After I received a half dozen good replies, I set out to mark the thread solved but could not find the proper button to click on. Someone told me where to look but when I went to where I was instructed to go, I did not find a recognizable button (button, label, menu heading etc). What I am I missing? (Hardware)