How do you change a burnt out tail light in a 09 Buick Enclave?

My wife%26#039;s enclave has a burnt out taillight.. How do you change the bulb ? I don%26#039;t see how to take the lens off or remove the light Assembly. It is NOTHING like my 67 Firebird. HELP ?!|||take it to autozone and act (sic) like a dumb blonde, they may put it in for you|||very carefully