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How to trade coupons and deals on a message board
Read the message board rules thoroughly.
Each message board is different from another, so don't assume that you can magically start trading automatically even if you know. Some boards may have posting minimum requirements before a person can start trading, limitations until a person has a certain amount of trading ratings, etc.
Get to know your fellow couponers. Aside from trading, the entire point of these message boards is to get and share knowledge with others about scoring great deals.