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The username which you need to provide is the one that you had registered at the Git Winch server.
Note: Git Winch can be privately hosted too. So to check the server that particular Git Winch is connected to, open gitwinch.ini and check this entry:
SystemAPIurl=
The website indicated there would be the place where you have to register and get your username.
If you do not have privately hosted Git Winch, the server you need to go to for registration is https://app.gitwinch.com