How do I disable comments?

Globally disabling comments on new pages and posts:

Go to “Settings > Discussion” and deselect the option “Allow people to post comments on new articles”. This applies to both pages and posts.

Single page/post disable comments:

To individually disable comments on a page or post, from the edit screen click the tab at the top right “Screen Options” and check “Discussion”. This adds a box to the edit screen where you can deselect the options for comments and trackbacks.