If you dont know how to remove or disable comment. or you want to disable comment in all page, use this plugin. This plugin is very good (i tried and works very superb).
This plugin allows administrators to globally disable comments on any post type (posts, pages, attachments, etc.) so that these settings cannot be overridden for individual posts. It also removes all comment-related fields from edit and quick-edit screens. On multisite installations, it can be used to disable comments on the entire network.