I Need Help

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I joined yesterday I am able to start new discussions but I can't comment. When I click on "comment" I can type a response. But there is no "submit" button. There is a "preview discussion" button under the comment box. If I click it, I am returned to a list of articles - my comment disappears (I was able to respond to a few comments to my own articles yesterday but not any more),,I have tried closing windows, rebooting the computer, logging out and logging back in. Last night I sent a message explaining my problem but didn't get a response. Has anyone else had this problem? Am I doing something wrong? I'm using AOL. Should I try Firefox?