Removing WordPress Native comments in favour of external systems

If you need to hide the comments, rather than run another plugin do two things

1) Go to Settings> Discussion and check the box: Comment must be manually approved
and uncheck Comment author must have a previously approved comment
also check the box for Users must be registered and logged in to comment

2) add this CSS to your theme’s CSS file, or better yet, go to Appearance > Edit CSS and copy & paste this there:

.comments-link{display:none !important;}

That will then hide the “leave a comment” link on your website.

Good luck!