Use following code and create wordpressapi.php file and upload this file to wp-content/plugins/ folder.

<?php
/*
Plugin Name:  WordPressapi Meta Box
Plugin URI: http://images.wordpressapi.com/
Description: Adding the Meta box to admin panel -> post
Version: 0.0
Author: WordPressapi
Author URI: http://images.wordpressapi.com/
*/

function wordpressapi_meta_box() {
add_meta_box(
'wordpressapi',
'Wordpressapi Box', //Meta box title
'write_in_meta_box',
'post' // You can define here where to add the Meta box(post, page, link)
);
}

function write_in_meta_box(){
echo "Wordpressapi is writing something in admin meta box";
}

if (is_admin())
add_action('admin_menu', 'wordpressapi_meta_box');
?>

Go to your Plugin tab and activate the “WordPressapi Meta Box” plugin.
After activating the plugin you are able to see the Meta box on post page.

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