WordPress Comments Explained
You can reply to comments in a number of ways, the easiest thing to do is when you visit a certain post, you scroll down to the comments and reply to any comment you want, the other option is to to this from within WordPress such as below:
Step 1: Login into your WordPress account and from the dashboard click on "Comments":
Step 2: Make sure to mouse over on the comment and you will be displayed with the following small menu, choose "Reply" to reply to that specific comment.
Step 3: All you have to do now is write your reply in the field below.