The discussion board is the tool to use when you want students to engage in conversation around specific topics. Discussions are organized into broad topics called 'forums.' Within each forum students post their responses to the topic -- these responses are called threads. Within each thread students engage in text-based discussion with each other. Normally there will be many threads per forum.
The following are links to videos with specific instructions:
For a general overview of the discussion board features, view this video.
Learn how to create discussion board forums.
Learn how to change forum settings. View this video if you want to change the original forum settings.
Learn how to grade a discussion forum.
Learn how to grade discussion threads.