How do I check the user ID?

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To check your user ID, access the "Change User Information" screen.
Reference: Changing user information

The user ID is the number after "id=" at the end of the URL of the "Change User Information" screen. Screenshot: The URL on the "Edit User Details" screen with the trailing number highlighted

A user ID is assigned automatically when a user is created. Once a user ID is assigned, it cannot be changed.