Filling out form 8862, and i clicked on "no" for a field, and i need to clear it. how do i clear it?

Delete the 8862 and start over. 

Steps to Delete a Form:

Sign in to your online account

Continue working on your return

Click Tax Tools on the left side bar

Click Tools on the drop-down

Click "Delete a form" on the “Tools Center” screen

Scroll to form 8862 and click Delete

Confirm the delete

To Re-enter:

Type   8862   into the search box on the top right of the screen

Click the "Jump to 8862" link