The creative exercises are graded from the exercises icon, third button on the right. The icon will turn pink when you have ungraded answers.
Click on the icon and go to the grading view. Choose the exercise and answer you’re going to grade, open the exercise from the side arrow and give points and feedback. Clicking ‘grade’ will send the grading to the team.
If you are not happy about the answer, you can also ask for a revised answer.