If you are using the TurboTax online editions, you must be working within the 2025 tax return for the links on the left side of the online program to be available.
If you have not paid for the online edition you are using, have not filed your tax return or registered the Free edition, then you can clear your return and start over with a lower priced edition. Click on Switch Products on the lower left side of the program screen while working on the 2025 online tax return. Click on Clear & Start Over