In order to customize the "Learning Badges", you can:
1. Click on "Settings" in the side-navigation bar.
2. Select "Gamification" from here.
3. Once done, click on the "Customize" button under "Badges"
Once done, you will be able to customize the "Learning Badges" from here.
4. Click on the "Learning Badges" heading here.
5. Select the "Theme" from here.
6. You can change the image by clicking on an existing badge image.
7. Click on the title to edit the title
8. Click on the points to edit the points.