Get your taxes done using TurboTax

To enter a IRA contribution -

Click on Federal Taxes (Personal using Home and Business)
Click on Deductions and Credits
Click on I'll choose what I work on (if shown)
Scroll down to Retirement and Investments
On Traditional and Roth IRA Contributions, click the start or update button

Eligible contribution will be on Schedule 1 Line 20 which flows to Form 1040 Line 10