There may be instances in which you build a signup form, but later decide that you would like to change the list that this signup form feeds into. Rather than cloning the signup form and attaching it to the new list, you can simply edit the form to feed into the correct list.
Change the List a Signup Form is Connected to
First, navigate to the form that you would like to edit from the Signup Forms tab. Next, click on the button that submits the form. A form can only have one Submit button.
Under the Button Click Action section, you can edit the list that the form submits to by selecting the new list from the dropdown.