To set up the Trello Connector you will need an API Key and a Secret.
You can find the API Key on the following page: https://trello.com/app-key
Under Allowed Origins > Current Origins enter your callback URL:
Your service domain can be found in your Cyclr console under Settings > General Settings > Service Domain.
Note the OAuth1 Secret:
You can now enter the API Key from Step 1 and the Secret from Step 3 in your Cyclr Console, and authenticate the Trello Connector.