export FLASK_APP eror

PS C:\Users\Snapinn-PC> export FLASK_APP

export : The term 'export' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify

that the path is correct and try again.

At line:1 char:1

+ export FLASK_APP

+ ~~~~~~

    + CategoryInfo          : ObjectNotFound: (export:String) [], CommandNotFoundException

    + FullyQualifiedErrorId : CommandNotFoundException

ini knapa ya gan.. Mohon di bantu saya baru belajar