To enable 2FA, you'll need to click on your Username on the top right of the screen, and then click Settings, as shown in the screenshot below.
Click on the Enable button.
After clicking on the Enable button, you’ll get the following message:
Follow the above steps, then enter the code from the Google Authenticator and click Enable.
To disable 2FA, click on Setting like in the first case, and then click Disable, as shown in the below screenshot.
Please feel free to contact us if you have any other questions. 😎