When you use online TurboTax you do not have direct access to the forms. Forms mode is a feature of the desktop download software, but is not available with online. All of your entries have to be made via the interview screens. You were provided with a suggestion that would let you choose to apply your 2024 refund toward your 2025 tax ---re-read the reply you received from @VolvoGirl .
With online TT you can preview your Form 1040 and Schedules 1, 2 or 3, but you cannot make direct entries to them.
PREVIEW 1040
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/preview-turbotax-online-retur...
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