Yes, you sometimes have need to edit some comments in the posts because this is internet and not everything is sane here. If there is something written in comment which you think is inappropriate and relevant to your post you can edit the comment and can remove the objectionable part.
Step 1 : Click on
'Comments', present in WordPress sidebar.
Step 2 : You can view the comments list for various pages. Hover the curser over the commnet you want to
edit, then click on
Edit to go to the editing page for the comment.
Step 3 : The Edit comment page gets displayed.
Here you can edit the
URL and the comment itself from the comment box.