Firebase login issue

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ReactJS

firebase : The term 'firebase' 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
+ firebase login
+ ~~~~~~~~
+ CategoryInfo          : ObjectNotFound: (firebase:String) [], CommandNotFoundException 
+ FullyQualifiedErrorId : CommandNotFoundException

What I have tried:

import firebase from "firebase";

I've installed firebase already, but problem starts from "firebase login" till deploy.