how to display this functions?

I want to add this my page.php. Does anyone help me?

if(function_exists(‘add_theme_support’)){
add_theme_support(‘post-thumbnails’);
}

function mallu_link_add_meta_box(){
$screens = array( ‘post’, ‘page’ );
foreach ( $screens as $screen ) {
add_meta_box(‘action_block’, ‘Action Block’, ‘mallu_link_meta_box_callback’, $screen, ‘normal’);
}
}

// Add meta boxes for action section on each post/page
add_action(‘add_meta_boxes’, ‘mallu_link_add_meta_box’);

function mallu_link_meta_box_callback($post){
// Security check
wp_nonce_field(‘mallu_link_save_meta_box_data’, ‘mallu_link_meta_box_nonce’);

// Get values of the action block fields
$action_prompt_text = get_post_meta($post->ID, ‘mallu_link_meta_prompt_text’, true);
$action_button_text = get_post_meta($post->ID, ‘mallu_link_meta_button_text’, true);
$action_button_link = get_post_meta($post->ID, ‘mallu_link_meta_button_link’, true);

// Display and populate fields from the database if it exists
?>
<p>
<label for=”action_prompt_text”>Action Prompt</label><br>
<input class=”widefat” type=”text” name=”action_prompt_text” id=”action_prompt_text” placeholder=”This should be short, to the point and less salesy.” value=”<?php echo esc_attr($action_prompt_text); ?>”>
</p>
<p>
<label for=”action_button_text”>Action Button Text</label><br>
<input class=”widefat” type=”text” name=”action_button_text” id=”action_button_text” placeholder=”This should prompt the visitor to take an action.” value=”<?php echo esc_attr($action_button_text); ?>”>
</p>
<p>
<label for=”action_button_link”>Action Button Link</label><br>
<input class=”widefat” type=”url” name=”action_button_link” id=”action_button_link” placeholder=”Copy and paste the link from the intended page.” value=”<?php echo esc_attr($action_button_link); ?>”>
</p>
<?php
}
// Callback for saving metaboxes
function mallu_link_save_meta_box_data($post_id) {

// Security checks
if(!isset($_POST[‘mallu_link_meta_box_nonce’])) return;
if(!wp_verify_nonce($_POST[‘mallu_link_meta_box_nonce’], ‘mallu_link_save_meta_box_data’)) return;
if(defined(‘DOING_AUTOSAVE’) && DOING_AUTOSAVE) return;

if ( isset( $_POST[‘post_type’] ) && ‘page’ == $_POST[‘post_type’] ) {
if ( ! current_user_can( ‘edit_page’, $post_id ) ) {
return;
}
} else {
if ( ! current_user_can( ‘edit_post’, $post_id ) ) {
return;
}
}

// Do the save/update
if(isset($_POST[‘action_prompt_text’])){
update_post_meta($post_id, ‘mallu_link_meta_prompt_text’, sanitize_text_field($_POST[‘action_prompt_text’]));
}
if(isset($_POST[‘action_button_text’])){
update_post_meta($post_id, ‘mallu_link_meta_button_text’, sanitize_text_field($_POST[‘action_button_text’]));
}
if(isset($_POST[‘action_button_link’])){
update_post_meta($post_id, ‘mallu_link_meta_button_link’, esc_url($_POST[‘action_button_link’]));
}
}

// Save action block details when the post is saved/updated
add_action(‘save_post’, ‘mallu_link_save_meta_box_data’);

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