The license code in entered in the TurboTax software that you install on a personal computer, not on the TurboTax online editions.
See this TurboTax support FAQ for entering the license code using the TurboTax desktop CD/Download editions - https://ttlc.intuit.com/turbotax-support/en-us/help-article/license-information/install-turbotax-cd-download-software-license-code/L1wFOSXur_US_en_US?uid=lc848p1j
@tjsil99 - are you going to download the sofware at the Turbo Tax website and when it gets installed, you will launch the software and it will ask for the activation code....which is the license code you have.