If you've created a Quiz, Test or Poll in the past and you would like to make edits to your campaign then here is how.
Select the course that you added your Quiz, Poll or Test to that you would like to edit. Then select the course:
Now the course creation engine has loaded. Navigate to the module which you had added the Quiz, Test or Poll and select the icon here:
The campaign will now load and you'll be able to navigate through it and make edits as you would like:
Once you've finished making edits then click 'Save' at the bottom of the course creation engine to save the changes.