Your quiz may have a range of question types, including essay and/or short answer. TheEssay question is the only one designed for manual grading. If you want to manually grade other questions in the quiz (eg the Short answer question type), you will have to override the automatic mark for that question. Follow these instructions if you want to manually grade another question.
Click on the quiz to view in a new screen
Go to Administration > Results > Manual grading
Click Also show questions that have been graded automatically link (above the table of questions and grades)
In the next screen, choose the question (short answer) and click the 'update grades' link
Change the grade and save the changes
Steps (manual grading)
The Manual grading report enables markers to manually grade written submissions within a quiz. This grading method is automatic for the Essay question type (irrespective of what the quiz is set to).
In the Questions that need grading screen, click on the grade link in the 'To grade' column
You have options for how you order the questions to mark them (by date, student first name etc)
Once you have chosen your options, you will get a list of student responses to mark
Click Save and go to next page when you have finished marking all those displayed. When you have finished, you will be prompted to return to the list of questions. Click Continue to go back to the Questions that need grading screen, which will be updated in the Already graded column