In the Training Section page - accessible via the sidebar - you can view all existing training sessions see setup a session for how to create one.
Clicking on 'Edit' will allow you to edit one.

Once in the edit menu you will be able to:

1. Insert an image
2. View the associated project
3. Change the name of the session
4. Check/uncheck if this is a course
5. Insert a short description of the training session
6. Define or edit the start and end date of the training session's availability
7. Write a welcome message for Users
8. Review / preview your changes

Further options include:
9. Add case collection notes
10. Select a reference image collection
11. Select which case collections associated with the Project should be included/excluded from this training session with the checkboxes
12. Change what role types can share the training session via a dropdown menu
13. Select which (if any) questionnaire should be displayed to users prior to completing the case collection content
14. Select which server/geo-replication the session should be hosted from see more here
15. Select whether users can see consensus data or not
16. Check/uncheck attributes that an admin has defined see section on system attributes