First, make sure you know which form you wish to delete and that you are absolutely sure you wish to delete it permanently. If the form is a saved form, go ahead and export it's data before you delete it (see section Reporting on Form Data). When you have completed that, follow these steps to delete the form:
Make sure you are logged into an administrative account that has permissions to use the Form Generator.
From your Control Panel, select the Site Content tab.
Find and select the Form Generator module.
You will be shown a list of your current forms.
Find the form you wish to delete and click the corresponding check box next to it's name.
Now select the Delete option from the drop box for the corresponding list (i.e.: Saved, Unsaved, or Unapproved).
Click Go.
You will now be asked to confirm the deletion of the form. Click Yes or No.
If you selected Yes, your form will be deleted and you will be returned to the form listing. If you selected No, the form will not be deleted and you will be returned to the form listing.