The fastest way to navigate to the estimated taxes section in the Online product is:
I can tell you how to navigate to the right topic.
Are you still able to open your return back up ("Take me to my return")? Or does TurboTax think you are finished, and you need to know how to re-open it?
The fastest way to navigate to the estimated taxes section in the Online product is:
Here's an alternate way to get there, but it's clumsier:
Federal Taxes tab
Deductions & Credits
If a page says "Your Tax Breaks", keep scrolling further down the page to a list of "All Tax Breaks" (you may have to click a tiny blue link that says "Show all tax breaks")
Then keep scrolling down to "Estimates and Other Taxes Paid"
Expand that category ("Show more") and the first topic is "Estimates."