Display post meta on edit page in admin

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I found the answer:

add_action('add_meta_boxes', 'add_contact_form_meta_box');

function add_contact_form_meta_box() {
    add_meta_box('contact-form-meta-box-id', 'Submission Data', 'contact_form_meta_box', 'contact_form', 'normal', 'high');
}

function contact_form_meta_box($post) {
    echo get_post_meta($post->ID, 'first_name', true);
}