Please, note that the org-trello format shown in the videos changed since they were released. An issue is opened about it. In the mean time, the org-trello format is described here.

Some video demo 1	2
Synchronize one entity	Install
Setup key and token	Attach org file to trello board
Synchronize one complete entity	Synchronize org to trello
Sync trello to org (new)	Synchronize trello to org (old)
Create board and sync	Create board with your keywords
Use the checkbox Luke	Kill entities
Cleanup routine	org-trello - webadmin
Simple help routine	Check your Setup