How do i change my method of paying my total owed to IRS? Want to change to a credit card.

You should be able to go back to that screen by using the "back" buttons.  This is assuming that you have not already transmitted your return.  If you have already transmitted, you could try calling the IRS:  https://www.irs.gov/help/contact-your-local-irs-office

If you have not filed your return already, please follow the below steps.

1. Sign in to your online return, if you're not already signed in.
2. Click File in the upper right corner and proceed to the Just one more step screen.
3. On this screen, click the first Revisit link (next to You've chosen to deduct your TurboTax fees from your federal refund).
4. Click View Payment Options on the next screen, and then select method on the screen after that.
5. Complete payment by entering information.
6. Continue to the Just one more step screen to make sure the method has changed.

If you have filed, you ca make a payment to the IRS directly using their service:

 

IRS Payment

 

TurboTax answer link