If you are using the TurboTax online web-based edition, there is no license code to enter. You purchased software to be installed on a personal computer, not to go online to do your tax return.
See this TurboTax support FAQ for entering the license code when installing the TurboTax desktop software - https://ttlc.intuit.com/turbotax-support/en-us/help-article/license-information/install-turbotax-cd-...
