session_start() needs to be called before you show anything on the page, so try this:
<?php
include 'connect.php';
session_start();
?>
<html>
<title>mmorpg</title>
<META NAME="description" CONTENT="browser based game">
<META NAME="keywords" CONTENT=" browser">
<META NAME="robot" CONTENT="index,follow">
<META NAME="author" CONTENT="Killer">
<META NAME="revisit-after" CONTENT="7">
</html>
<?php
if (isset($_SESSION['player']))
{
$player=$_SESSION['player'];
$userstats="SELECT * from Bleach_users where playername='$player'";