For those wanting a more Secure Account, a great way to do this is through Two-Factor Authentication. Two-Factor Authentication is an authentication method that requires you to provide an additional verification factor to gain access to your Account.
Click your Profile picture:
Then go to the person tab and click Preferences:
Now from the dropdown select Security:
Select Manage Two-Factor Authentication:
Enter your password:
You will then have options to choose from to enable Two-Factor Authentication: