You can read and contribute to course discussions using the edX app whenever you have an internet connection. In your course, select Discussion.
At the top level of course discussions, you find categories of posts or Topics, usually organized based on course structure. Within each category, you see lists of posts by learners. Each post has indicators to show the number of comments and responses the post has received. The number of unread comments for a post is shown until you have viewed a post.
You can select a topic to view the posts made within that topic or select All Posts to view all posts made.
Click Create a new post to create a new post while viewing all the posts within a Topic. Click Add a response to reply to a post you're viewing.
When you view individual posts, you can add a comment or a response, or upvote a post. Posts by community TAs or course staff have a role indicator next to their username.
For more information about course discussions, see Participating in Course Discussions.