Besides setting up schemas in the Settings page, you can also set up schemas for individual posts and pages.
To set up a schema for a post or page, edit it and see the schema settings in the Schema meta box below the post editor.
By default, the post will inherit the schema from the global settings. If you want to override the global settings, select a schema from the dropdown. All the properties in the schema will be displayed for the post.
When you finish editing the schema for the post, click Save or Update to save the changes. This schema will be used for the post and will override the global settings.