There is no license code for the TurboTax online editions.
If you purchased the TurboTax software either as a CD or Download, install the software on your personal computer and when the application is opened you will be asked for a license code.
See this TurboTax support FAQ for the license code - https://ttlc.intuit.com/community/tax-topics/help/i-can-t-find-my-license-code/01/852973
