We've made it easy to edit your existing forms even after they've been released to candidates. Simply click "options" next to your form.
You can then click "edit" from the menu that pop up.
This will take you to the editing settings where you can make your changes exactly as you did when you created your form. The overview page will let you set up change the form title and the deadline and form description.
"Questions" will allow you to make changes to your form and edit your questions: