If the feedback form is not being used in any survey at all, you can archive it in the "Feedback forms" section.
If it is still in use, go to the survey it is linked to in the "Surveys" section and connect it to a different feedback form:
Remember to save your changes!
When you return to the "Feedback forms" section, click on the feedback form which you would like to archive and then click on "Archive feedback form":
Click here to find out more about activating a feedback form.