LiveChess - time added to opponent's clock

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Man, I haven't been a member all that long, but already I've lost a few games because I wasn't watching the clock. I mean in , like 2 to 3 minutes. I wasn't prepared for that. To me, chess is a game of head knowledge and smart moves, even if my opponent seems to have more knowledge and smarts than I have...... I like "Online Chess" best. Usually, there is someone to play live with, or at least pretty much. "Live Chess" is great too, however, I still get snookered into those 2 minute games so I have to be very careful.......I know this probably doesn't help you much, but it does help me to vent a little..... I do know I will have alot of questions. I just don't know what they will be, yet.
Thank you much.