You can exchange money at banks and at official exchange counters. The airport will have money exchange counter, although money changers at the airport tend to offer less favorable exchange rates. Avoid scams and do not exchange money on the street.
Before you leave, check with your bank to see if it will be possible for you to use ATMs in Myanmar. This is a convenient way to get money on the go, but will most likely come with a steep fee. For the best deal, bring clean, not creased, recently issued US $100 bills and exchange them at a bank or exchange counter outside of the airport.
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