well, when I was writing this tutorial ... (meant for beginners in gallery and php concept) I didn't wanted it to be too much in one go becuase that sometimes makes people a little apprehensive about its application ...

though i totally agree with you that admin section is as important as the gallery itself ...

well if you are getting a blank page, just for now upload your admin.php (the name i gave it, you can change it to anything else) in your gallery directory .... and then if you wish to move it later to someother location ... then simply change the path of config.inc.php (relative) ...