2FA or MFA is now needed to be done if you are an Administrator or Moderator, if you are a member, it is optional, however if your account gets stolen and you cannot retrieve it, we cannot do anything about that unless you have insanely good proof about you owning the account.
To enable 2FA Authentication you have to press your profile picture, then go to Profile - Security and you can now press Enable 2FA.

After you have enabled it you should save your Backup codes in a safe place DO NOT lose these Backup codes, otherwise if you lose all access to your account, you won't be able to retrieve your account.
We suggest that everybody uses Multi Factor Authentication.
You can use Google Authenticator or Authy and more authenticators for Ephemeral.