To answer a question, click the first empty "Answer..." field under the question you want to answer:
You can include an image with your answer, format your text, or include lists using the editor bar that appears at the top of the answer field. When you are done, click the "Answer" button.
To comment on another user's answer or comment, click the conversation bubbles next to the number of comments, as shown below:
Enter your comment in the field provided. When you are done, click the "Comment" button to submit your comment.