Instructions
Press "X" on the user's icon under the "Log In" arrow icon on the main menu to log in as the user you would like to delete.
Scroll to the user's icon and press the "triangle" button. Navigate to "Options" and select "Delete." This will delete the user in the system. All of the content downloaded by that user will also be deleted.
Go back to the main menu to select "Create a new user" under the "Users" tab. The name can be up to 16 characters long and can be changed under the "Options" menu.