To activate TurboTax after installation, start by launching the program on your computer. If you purchased a CD or downloaded it from the official site, ensure you\'ve completed the install turbotax process correctly. Once opened, you’ll be prompted to enter your license code, which is typically found on the retail card or in your confirmation email. Enter the code exactly as shown, then click “Continue” to complete the activation. Make sure your internet connection is active, as the software may need to verify the code online. After activation, you can begin preparing your taxes using the full features of TurboTax.