You can enable it via https://id.atlassian.com/manage/two-step-verification. This would only work for your account.
However, if you're referring to Atlassian Access 2FA which would affect all Atlassian Account associated with the verified domain, you would need to exclude all the accounts except yours, once it's enabled. It's a manual work and a bit tedious if you have a lot of accounts associated with the verified domain, but it would allow you to manage all accounts.
We have a guide on how to do both:
Update: That's a wrap! Thanks so much for your questions. If you didn't make it for the live AMA, not to worry. Add your questions below and I will get to them ASAP. Hello Atlassian Community...
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