You can use the 2-Factor Authentication via the Authy Desktop application. To get started with the Desktop application go to:

Authy Download page

Choose the version required by your operation system, and click download

When the program is download, start the install process and follow the instructions on the installer.

You are also required to add your email address on the next step

Validate your account either by SMS  (only to mobile phone, not to users with landline registered numbers) or Phone Call

    By SMS

Enter the 6 digit code manually or click the link on the SMS to validate account

    By Phone Call

A two digit code will be displayed and you will be called within 30 seconds, enter the two digit code to validate your account

When you account is validated the application looks like this: