If you purchased the TurboTax software as a download you need to install the software on your personal computer, Window or Mac. During the installation you will be asked for the license code.
There is no reason for you to access the TurboTax online web-based editions since you have already purchased the software to install on a computer.
See this TurboTax support FAQ for the license code - https://ttlc.intuit.com/turbotax-support/en-us/help-article/product-system-requirements/find-license...
