If you've received a request for more information or an answer to the question you mentioned, you are able to see and respond to the replies by doing any of the following:
If you received a request for more information about your question you can visit your question page and then right below your question there will be a link that will display the number of comments on your question. See image 1 below.
Click the 1 comment link to display the comments on your question.
If your question has no comments you can click the more option and then click add a comment. See image 2 below:
If you received an answer and would like to view the comments on the answer, the process is similar. Just visit your question page and in the answer there is a link to view comments. See image3 below:
For example if you clicked on the 3 comments link you will see all the comments on the answer.
In all the cases these links will also allow you to comment or reply to a comment if needed.
Hope that helps, but please feel free to leave comment and I will be more than happy to help you troubleshoot more.