How do I go back and check if I claimed something?

In TurboTax Online, just go to the Hi [You], let's keep working on your taxes! Screen.

Go to the dropdown for each category displayed – Personal Info, Income & Expenses, Deductions & Credits, etc. – and select the Review/Edit button.

Then, you can go through each screen and review what you’ve input.

And, to preview your return in TurboTax Online: 

1. Click Pick up where you left off if it’s on your screen.
2. Click on Tax Tools in the left pane.  
3. Click on Tools. 
4. Click on View Tax Summary. 
5. Click on Preview my 1040 in the left pane.

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@glittergolf 

Always print a copy of your completed tax return for your records, and review it carefully before e-Filing.
You will need it if you are audited by the IRS, or to amend if a TurboTax update changes your return or for any other reason,
SUCH AS,   you just  realized you made a mistake .
AND, to find your AGI next year.