Go to the "Survey" section .
Click on the "Edit" drop down list to the right of the survey which you would like to deactivate:
3 options will appear. Click on "Deactivate":
The systems shows you which surveys are active/inactive:
If you would like to activate the survey again, simply click on "Activate" in the "Edit" drop down list.
Click here to find out more about creating new surveys.