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The username which you need to provide is the one that you had registered at the Git Winch server. But please 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=<url>
Extract the domain name from the url value indicated after the equals-to sign. That would be the website where you have to register and get your username.
If you are not using a privately hosted Git Winch, follow the registration link at our main website: https://gitwinch.com