Sign into the account you are currently in then
Under Tax Timeline, click on Take me to my return. (Please note that you need to be in your return in order to get the tools and be able to delete a form.)
Go to "My Account" > "Tools"
Under the Tools Center, select "Delete a Form"
Please note that you may need to delete all information related to this form in TurboTax system before the form will delete. So you may need to go back under the section, if any information or amounts are entered, and delete all these entries first.