To activate TurboTax after installation, launch the TurboTax software on your computer. When prompted, enter the 16-character license code found on your product box, email receipt, or online order confirmation. Follow the on-screen instructions to complete the activation process. Make sure your internet connection is active during activation. If you encounter issues, double-check your license code and try again. For additional help, visit installturbotax.com (https://install-turbo-tax.com/) for detailed support and troubleshooting tips. Activating your TurboTax ensures access to the latest updates and allows you to begin filing your taxes with confidence and full functionality.