I accidentally turn on 2 factor how do I turnout off

For information about turning off two0factor authentication for your Apple ID, see the following from: Two-factor authentication for Apple ID - Apple Support

If you're already using two-factor authentication with your Apple ID, you can't turn it off. If you updated to two-factor authentication inadvertently, you can turn it off within two weeks of enrollment. If you do, your account is less secure and you can't use features that require a higher level of security.

I believe that you need the email you received when you turned it on in order to turn it off.