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:
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
15. Select whether users can see consensus data or not
16. Check/uncheck attributes that an admin has defined see section on system attributes