How can I get backup verification codes?

How can I get backup verification codes?

I set up Google Authenticator as my MFA for Zoho CRM. I use it for other apps so don't need OneAuth.

When setting it up, I forgot to save a backup of the verification codes.
How can I do that? I am able to login as Google Authenticator works. But just in case I lose my phone, I need the backup codes.

The documentation says: But I don't see  that tab?
Click on the Two Factor Authentication tab on your home screen, then click Manage Backup Verification Codes

But I don't see  that tab? 
Where should I look?