How do I disable comments?
Individual Pages and Posts
To disable comments on individual pages and posts, first activate the Discussion settings box in the Screen Options tab:
Next scroll down the page tothe Discussion box and toggle the comments section on and off for that page or post:
Disabling comments sitewide isn't a native feature of WordPress. To accomplish this, install and activate the Disable Comments plugins and navigate to Settings > Disable Comments to save your desired settings: