how to make money payment? I am using multibit and I need to buy some bitcoin (real money needed) and sell bitcoin(real money needed too)

But I cannot find any article on google that guide you how to make the money payment in transaction.

how can I pay or recieve money when I try to buy or sell bitcoin？

thank you so much
You have to use a Bitcoin exchange. The most popular one is MtGox

There are other ways but I think this is the safest one and easiest.