Go to : http://elegantt.com

Click on "Install the Chrome extension"
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Go back to your Trello boards and click on the new Elegantt icon next to the board title
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Log in with your Trello account & approve the app permissions
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Do you want to enable Elegantt on this board ? YES, please !
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And that's all!

  • Every change to Trello is automatically reflected in Elegantt: cards, lists, assignments, etc.
  • You can choose whether or not to generate an Elegantt schedule for each of your boards.
  • All of your data stays with Trello. We don't copy any of it to our servers without your permission.

Enjoy :)