How do I remove an icon from the bottom taskbar?

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http://androidforums.com – Hi, I have an LG Enlighten and by mistake, I dragged the icon for Polaris Viewer to the bottom taskbar, and it went on top of the message icon and I can't remove it at all. I tried dragging it down to the garbage but it won't budge. I've removed an icon before from that bottom taskbar, but I just can't remember how I did it. (General)