The “My Communities Widget” shows the communities you are joined to.
Clicking the green discussion button will take you to the community’s discussion board where you can interact with other community members and access shared documents.
“Discussion Boards” are a group-oriented messaging system that can be attached to courses and communities. To visit a course or community’s discussion board, click the icon for that course or community from your “Enrollments” and “My Communities” widgets. Clicking the icon will take you to the discussion board for that course or community. From there, you can view and participate in discussions relevant to that course or community. To post a new message to the discussion, enter your message in the “post message” field, and click the “Post Message” button. Your message will be posted to the discussion, or if your administrator has turned on moderation for the discussion, it will be sent to a moderator for approval. You may also comment on other user’s posts by entering your message in the “post comment” field and pressing the “Enter” button on your keyboard. Note that comments on posts are subject to the same moderation rules as new posts.