Get password verify to work

setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    //echo "Connected to DB successfully";
    }
catch(PDOException $e)
    {
    echo $e->getMessage();
    }
global $bcrypt; // making the $bcrypt variable global so we can use here

       // $timed       = time();
$ip         = $_SERVER['REMOTE_ADDR']; // getting the users IP address
if(isset($_POST['register']))
{
    $password = $_POST['password'];
    $name= $_POST['name'];
    $surname     = $_POST['surname'];
    $ID = $_POST['ID'];
    $phone      = $_POST['phone'];
    $email    = $_POST['email'];
    $name1 = $_POST['name1'];
    $surname1    = $_POST['surname1'];
    $phone1       = $_POST['phone1'];
    $email1      = $_POST['email1'];
    $relationship = $_POST['relationship'];
   // password_hash($password, PASSWORD_DEFAULT);

        
    $password =password_hash($_POST['password'], PASSWORD_DEFAULT);
    

  
    
                            try{
            $query = "INSERT INTO visitors(password,name,surname,ID,phone,email,name1,surname1,phone1,email1, relationship) 
                      VALUES(:fn, :ln, :em, :con, :ph, :ag, :pr, :na, :ge, :ci, :th)";
            $stmt = $conn->prepare($query);
            $stmt->bindparam(":fn",$password);
            $stmt->bindparam(":ln",$name);
            $stmt->bindparam(":em",$surname);
            $stmt->bindparam(":con",$ID);
            $stmt->bindparam(":ph",$phone);
            $stmt->bindparam(":ag",$email);
            $stmt->bindparam(":pr",$name1);
            $stmt->bindparam(":na",$surname1);
            $stmt->bindparam(":ge",$phone1);
            $stmt->bindparam(":ci",$email1);
            $stmt->bindparam(":th",$relationship);
            
            $stmt->execute();
        
            header('location:learnerlogin.php');
               
            }
            catch(PDOException $e){
                echo $e->getMessage();
            //}
        /*?> window.location.href = "index.php"; 
my login script looks like this 
prepare("SELECT username, password FROM visitors WHERE 
username=? AND password=? ");
$query->execute(array($user,$pass));
$row = $query->fetch(PDO::FETCH_BOTH);
$password = $password;
if(password_verify($_POST["password"], $password)) {
  $_SESSION['username'] = $user;
  header('location:studentportal.php');
} else {
  $message = "Invalid login credentials";
}
}
}
?>

What I have tried:

i tried youtube tutorials, exemplary scripts