Two step authentications is a security feature that helps you to protect your Facebook account, you will be asked to confirm your login attempt or to enter a code that has been sent to your mobile. But Sometimes its become very hectic or annoying to enter code every time you login from unknown browser, if you don't have access to your phone you might not be able to login in facebook. However you can deactivate this high security feature,to deactivate this feature please follow below steps:-
1 Go To profile page
To deactivate two factor authentication, first go to your profile page and than click on the drop down symbol given on top right corner.
2 Select Settings and Privacy
In the drop down symbol you will get some options please select settings and privacy.
3 Select Settings
In settings and privacy select settings option.
4 Go To Security and Login
You will be directed to general account settings page in which you need to click on security and login.
5 Go To Two-Factor Authentication
Go to two-factor authentication and click at "On" button given below two-factor authentication.
6 Enter Your Password
You will be asked to enter your password, enter your password and then click on continue.
7 Click On Turn Off
You will be leaded on two-factor authentication, you need to click on turn off button to deactivate your two-factor authentication.