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If you have access to add additional Staff, you can set up Two-Factor Authentication at account creation under [Settings] > [System Settings] > Staff.
Help! I've lost the token to my Staff account. How can I disable Two-Factor Authentication?
If you are locked out of Blesta because you lost your 2FA token, you must disable Two-Factor mode in the database for your user. To do so, you must make a change manually to the database using a utility like phpMyAdmin. Find your user in the "users" table, and update users.two_factor_mode to none, and save. You will now be able to login with just your username and password. Once you have logged in, you can set up 2FA again under My Info.