how do i open previous years tax worksheets?

To access your tax returns (current or prior year) you will sign into the TurboTax website with the user ID you used to create the account - https://myturbotax.intuit.com/

Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show.  Click on the Year and Click on Download/print return (PDF)

As an alternative for current year return, when you sign onto your online account and land on the Tax Home web page, scroll down and click on Add a State (You will not really be adding a state). 

This will take you back in to the 2024 online tax return.

Click on Tax Tools on the left side of the online program screen.  Find the Print Center and choose the year you want to print.  If you want your full return including worksheets, choose the option Include government and TurboTax worksheets.