Use Users Setting field (username) in another view

I've created this app, and the initial view displays the User Settings screen to prompt for the username and password, which are related to the 'Users' table with columns ID, User, and Password. Once the user successfully logs into the app, a 'Register' view appears where the user must fill in the Date and Number of cars, but in field UsersWhoRegister must be autocompleted with the user who logged in. How can I achieve this?

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