When you view the training catalog, images appear for each course.
How do I upload an image?
These images are posted on the organization's website.
To enter the internal site for each organization, go to Administration > Organizations. Select an organization and fill in the "Website" field. The organization's logo will then automatically appear in the catalog on all courses linked to it.
The organization's website can be imported when you create training courses with the import module (link to help page).