To enable your 2 Step Authentication go to your profile settings. Click on your name in the upper right corner and select profile. Select the "security tab" and then check the 2 Step Authentication box. You must have a mobile number assigned to your account. If you do not have one assigned you will receive an error message.
To disable 2 Step Authentication just un-check the box.
To assign a mobile number, while still in your profile setting, click on “Personal Information” tab. Enter your mobile number in the box that says “Mobile”.
Note: If you do not want your mobile number to be public or to show on your virtual business card https://botdoc.atlassian.net/wiki/x/JwBB then the box below that says: Show this Mobile phone in personal card on completed Request's and Personal URL. (do not check)
This is the log in screen that will pop up when you have your 2 Factor Authentication enabled.
NOTE: EXPIRES in 60 seconds AND you have the option to RESEND code to your mobile or RESEND to your email. Code = 6 characters (alpha and numeric)
*Sometimes mobile carriers will delay their sends to you (doesn't happened often) but if it does you have the option of sending to email for quick code.