How do i change the Noncash Contributions Worksheet?

The information on worksheet is changed through non cash contributions screen. You can get to this area in turboTax Online by following these steps:

1. Open (continue) your return in TurboTax.
2. In the search box, search for donations and then select the "Jump to" link in the search results.
3. Answer Yes to Did you make any donations to charity?
4. Answer No to Do you have an account with ItsDeductible Online?
5. On the next screen, answer Yes to enter your donations for 2017.
   
6. Continue with the onscreen instructions.

If you want to change it directly then you will need to change software from TurboTax Online  to Desktop version.

Form 8283 is completed automatically by Turbo Tax if the combined value of all the property you donate is more than $500.  All you have to do is enter all of your charitable contributions and the Form 8283 will be included in your tax return, if required.