Switch

1. Scroll to System Settings and press A.

2. Scroll to User and press A.

3. Scroll to Add New User and press A.

4. Press A.

5. Scroll to a desired icon and press A or scroll to Create Own Icon and press A.

6. Enter a Nickname using the on-screen keyboard and press the + Button or scroll to OK and press A.

7. Press A to select the OK option.

8. Register a currently existing Nintendo Account or select Create Account to create a new Nintendo Account.

Alternatively select Later to take this action later from the Settings.