Can, and or where can I find how much I paid for taxes in past years? Specifically income tax?

To access your current or prior year online tax returns sign onto the TurboTax website with the userID 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)
You can get free federal tax returns transcripts from the IRS - https://www.irs.gov/individuals/get-transcript

For 2017 and prior the Federal tax is on

1040 line 44 and total tax line 63

1040A line 28, total tax on 39

1040EZ lines 10 and 12