If you have already e-filed, wait until your return is accepted or rejected by IRS / the state.

                -If your return is rejected, add your new information (along with anything else that needs to be corrected)                              and then re-submit your return.  See  Fix a reject

                -If your return has been accepted- you cannot change the information. Instead, you have to amend a                                       return.   See instructions below.

IRS does not allow e-file for amendment,  you will need to submit the amendment forms with related supporting documents by mail. (Follow instructions through the step-by-step interview questions in the program)

If your original return generates a refund, you should wait until your original refund arrives before you file your amendment. You can cash your check, but you still should wait until your current tax return is resolved.  Note that if you see " Do Not File" watermark on your Form, this means your original return is either still pending or forms are not finalized yet.

https://ttlc.intuit.com/replies/5114064

As you are going through the amendment process,

1.  On screen, Do you need to change anything else?

2.  Scroll down to Deductions and Credits, select Edit

3.  Next screen, select Retirement and Investment / Traditional and Roth IRA Contributions, select Start 

If you have not filed, to enter your IRA contributions in the TurboTax Delulxe online program,  here  are the steps:

1.  After sign into your account, select Take me to my return

2.  At right upper corner, in search box , type in IRA contributions and Enter 

3.  Select Jump to IRA contributions 

4.  On screen, Traditional IRA and Roth IRA ,select your options and follow the prompts.

Per IRS, only the contributions made to traditional IRA is allowed for a deduction.