Help! I something is wrong with either mylot page or my pc

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For the last few days I was too busy that I was not able to check mylot, and now I can't seem to find the place how to log out. Is there something wrong with mylot page or my pc? Can anyone out there tell me how to log out? I don't want to shut down my pc without logging out, knowing it could be opened by anyone. Please is there someone out there who can help me?