Need to update form 1310 but can't see to find an area to select a form from the documents area. It wants you to upload documents .

You appear to be using TurboTax Online, so you can't select forms.  However, to change an answer on Form 1310:

1. Search for form 1310 in the Search field in the upper right corner of TurboTax
2. Select the jump to form 1310 link
3. Proceed through the screens that generate, making any changes necessary

If this isn't what you need, feel free to post back with more information.