Where do i enter my Roth IRA catch up contributions ?

You do not need to include contributions to a Roth IRA in your return because there is no deduction benefit for contributing to Roth. 

While Roth contributions are not reported on your tax return, it is a good idea to enter them the in the IRA contribution section anyway because TurboTax will:

• track the basis of your contributions for you year-to-year. [This becomes important when you start making withdrawals--to track how much of the distribution is taxable.]
• alert you if your MAGI exceeds the Roth contribution limit and are subject to a penalty.
• alert you if you have insufficient earned compensation to contribute.

To enter contributions to a Roth IRA in TurboTax, please follow these steps:

1. Click on Federal Taxes > Deductions & Credits  
2. Scroll down to the Retirement and Investments section and click on the Start/Revisit box next to Traditional and Roth IRA Contributions.  [See Screenshot #1, below]
3. On the Traditional IRA and Roth IRA screen, mark the box for Roth IRA and click Continue. [Screenshot #2]
4. On the Roth IRA Contributions screen, click the Yes box. 
5. Click the appropriate box on Is This a Repayment of a Retirement Distribution?
6. On the Enter Your Roth IRA Contributions screen, enter the amount of your contribution and click Continue.