If you are entering your own questions into a quiz and using Essay questions, you will need to manually grade those questions once students complete the quiz.
Click the paper icon
In the column for the quiz where you included Essay questions, click the paper icon to open a grading dialog box where you can grade the quiz. There will be one paper icon per student who completed the quiz.
Enter scores in the appropriate boxes
Note that you can use fractions for the scores in these boxes.
Specify feedback for which question
By default, this feedback is for the entire assignment. To indicate that feedback is for specific questions, use the numbering feature in the toolbar at the top of the dialog box to number your feedback according to question number.