I am not able to use any commands

[ioanmuntean]

I tried to type grammarly.login but all I get is a red message like this:
PS C:\Xxxxx grammarly.login
grammarly.login: The term 'grammarly.login' is not recognized as a name of a cmdlet, function, script file, or executable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

What folder or where should I be in order to make Grammarly work?
Thanks!