Supported authentication methods
Select "OAuth" in the first step of integration wizard. Click "Next".
You will be presented with dialog asking you to authorize Bugsee. You need to select default channel you want to post messages from Bugsee to. Note, that you can change that in the last wizard step on a per application basis. Click Authorize to allow Bugsee access your Trello.
There are no any specific configuration steps for Trello. Refer to configuration section for description about generic steps.