how to enroll in lightning login not getting any option for enrollment in user setting . How to enable enrollment setting for system admin

Forum Ambassador Maham Hassan (ConX Digital)
Hey Chandra,
- From Setup, enter Session Settings in the Quick Find box, then select Session Settings.
- Review the default settings for Lightning Login.
- Make sure that Allow Lightning Login is enabled.You can disable Allow Lightning Login at any time to switch users back to username and password logins.
- Decide if you want to make Lightning Login available to all users or only users with the Lightning Login User permission.
- Confirm that a Standard session security level is appropriate for this login method.Lightning Login establishes a Standard security level for the user’s session. Standard is the default security level for the Username Password method that Lightning Login typically replaces. If needed, you can change the security level to High Assurance.
- Assign the Lightning Login User permission to users in the user profile (for cloned or custom profiles only) or permission set. Lightning Login isn’t supported for external users.