Go to the Commons tool.
Select the Commons tool from the Tool Menu of your site.
The Commons page will display.
The most recent posts will appear at the top of the screen.
Click the Delete link below the comment/reply you want to delete.
Note: You must have delete permissions in order to delete your own or other posts in Commons.
If you are sure you want to delete the comment, click OK to confirm.
The comment/reply will be permanently deleted.
Note: Deleting a comment/reply to a post will not affect the original post that was commented on.