Once logged into the portal, click on your username in the top right-hand corner and select "Edit Profile."
On the left-hand side of the screen, select 2FA and you will then see the option to "Enable two-factor authentication."
A QR code will appear that you will need to scan with an Authentication App (Google Authenticator, Microsoft Authenticator, etc.) The app will give you a token that you will enter in the Token field. Then click "Verify Token."