The first step to activate it is to access 'User profile':
Then, select 'Two-factor authentication' from the menu and click on 'Enable two-factor authentication'
A message will appear regarding the need to use one of the authentication applications mentioned above.
After confirmation, read the instructions carefully. Configure one of the authentication applications to provide the necessary verification codes in the additional verification step or you can manually enter the key which will also be generated upon activation. A list of 5 backup codes will also be displayed.It is necessary to save or print them. A backup code can be used only once, in case you do not have access to the authentication application.
The additional step required for verification will look like in the image below:
You can disable it anytime!