If you wish to disable comments on a select page/post, simply:
- Go to the Edit screen of that page
- Make sure that “Discussion” checkbox is checked off in the “Screen Options” (Screen Options are found at the top right of the “Edit Page” page(Figure 1))
- Find the “Discussion” section on the “Edit Page” page and deselect the “Allow comments.” checkbox(Figure 2).
Figure 1. Check on the “Discussion” section
Figure 2: Disable Comments on a Page/Post