Turn editing on
Click add an activity or resource
Select Feedback
Give it a name and Description
Then click save and display
Then click the header Templates
and from the drop down select Class Feedback and click use this tempate
Either append or in most cases Delete old items
You then get a preview but you can just click on the course again. Turn editing off and you are done.
Then all thats left is for students to select it.
As with all moodle modules you can set the anonymity and times in the initial set up.