If you need to change the marking on a question, you can do this by following the steps below.
Step 1 - Open the task
From your dashboard, either click the task if it is shown, or click View All Tasks and then select the task you want to edit.
Step 2 - Open the question
Once on the task, click the tick or cross for the question you want to amend. If you have enabled the Use exam marking setting for the task, you will see scores (for example, 0/3) instead of ticks and crosses. Click the score you want to change. This will bring up a detailed view for that question, showing the question, the student's answer, and the correct answer.
Alternatively, you can click View attempts under the student's name to go onto their task attempt and find the question you want to edit.
Step 3 - Overwrite the marking
Click the current tick, cross, or score for the question. A pop-up will appear, allowing you to change the student's mark.