What you need

1. index.php
2. new directory (folder)
3. .png image

Ok so start off with a index.php and here is the code that you will need..

 <?
header("Content-type: image/png");
$im = imagecreatefrompng ("yourip.png");
$colour = imagecolorallocate($im, 255, 255, 255);
$ip = "$_SERVER[REMOTE_ADDR]";
imagestring($im, 3, 71, 2, $ip, $colour);
imagepng($im);
?>

Now you need the a image here one for the tut..(duh)
(save it)

Now you need to make a folder via FTP mine is called yourip but you can call it what you want.

Then all you gota do is upload it..