If you are installing the TurboTax software on a computer you have to use the License code that was issued for the software when installing.
See this TurboTax support FAQ for the License code - https://ttlc.intuit.com/turbotax-support/en-us/help-article/product-system-requirements/find-license...
How to install the software with the License code - https://ttlc.intuit.com/turbotax-support/en-us/help-article/license-information/install-turbotax-cd-...
If you are using the TurboTax online web-based editions you Must sign onto the TurboTax account using the exact same User ID and Password you used to create the online account - https://myturbotax.intuit.com/
What PIN are you referring to?
The Identity Protection PIN sent to you by the IRS? - https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/add-remove-6-di...
The 5 digit self-selected PIN when e-filing a tax return?
The 6 digit verification code sent to you by TurboTax? - https://ttlc.intuit.com/turbotax-support/en-us/help-article/security-risk/trouble-filing-verificatio...
