How do I make changes if my tax return is already submitted to the IRS?

If you find that it’s already been accepted by the IRS, but you have to make changes, you’ll have to file an amended return to report those changes. 

We can’t file amended returns for you. But check out this IRS link to learn more about filing amended returns https://www.irs.gov/faqs/irs-procedures/amended-returns-form-1040x