If you have already filed, the only way to make changes is to file an amended tax return.
If you want to file an amended tax return after IRS accepted your tax return due to a mistake or a missing document, then you will want to wait until your original tax return is processed by the IRS. If you are receiving a refund, you should wait until the check is issued. Amended returns must be filed by mail.
To amend a 2016 return, follow the steps in the article below: https://ttlc.intuit.com/replies/5114064
If you haven't already filed, then you can click Take me to my return to make any necessary corrections.