php mysql user register and login page

Hi Digitalocean sweet childs

I am new member on Digitalocean and ı purchased myphpadmin Droplet for smartphone apps sing up, register sing in the menu.

Firstly ı am created Lapidary table on phpmyadmin panel.

Then I created register php with notepad++ then save /var/www/.

My copy code:

<?php                
$mysqli = new mysqli("http://64.23.198.***","root","*****","Lapidary");

// Check connection
if ($mysqli -> connect_errno) {
  echo "Failed to connect to MySQL: " . $mysqli -> connect_error;
  
}else
	echo "Connetion";
}
?>

register.php “connection” did not work.

I am use filezilla, wordpad++,

Is anyone help me for user register login page connection on Digitalocean?

should i purchased something else?