I put in nontaxable combat pay on my taxes by accident how to fix

Are you military?

Any combat pay would have been entered on your W-2 in box 12, with Code Q.

If you are not military then go back to My Info and change the selection for being in the military.

This was my first time I sent it off already omg 

If you filed, it is like dropping it into a mailbox - you cannot get it back.

You'll have to wait until your return is either accepted or rejected.  IRS just posted that they will not start processing until 2/12 so you will have to wait ...

• If rejected, you can make any necessary changes.
• If accepted, you'll need to amend your return. 
• To avoid unnecessary delays, do not amend until your original return has been fully processed.  You will need to print and mail the amendment.  
• Allow 8-12 weeks for processing.

See this TurboTax FAQ for help with amending.

You can check the status of your amended return here, but allow 3 weeks after filing for it to show up.

Thank you very much