In order to enable two-factor authentication, you must first provide your phone number. See Adding a Phone Number.
Navigate to your Profile page.
Click the "Enable Two-Factor Authentication" button in the "Account Security" section of your Profile. If you have not yet added a phone number, you will be prompted to do so.
Click "Send Code" in the "Enable Two-Factor Authentication" dialog to receive a one-time code via text-message.
Enter the code you receive and click "Enable Two-Factor Authentication."
When you login to WayScript, you will be prompted for a code.
When logging in, you have the option to "Trust this computer." This will prevent Two-Factor Authentication prompts from appearing on that device for up to one month.
Navigate to your Profile page.
Click the "Disable Two-Factor Authentication" button in the "Account Security" section of your Profile.
Click "Send Code" in the "Disable Two-Factor Authentication" dialog to receive a one-time code via text-message.
Enter the code you receive and click "Disable Two-Factor Authentication."