Step 1:
From the Mirodo dashboard, click rewards on the sidebar on the left hand side.
Step 2:
Click the 'task trophies' button.
Step 3:
From here you can add a trophy by clicking the 'award task trophy' button.
Step 4:
This will open the task trophies menu. You can now create a trophy, decide what percentage is needed to attain it and assign which students it will be available for. After creating your trophy, click 'add' and it will be available for students to earn.