The above script doesn't make use of a database. Also, it doesn't describe how to make a registration form. You need to
1. Create aregistration form where the user fills in his desired username and password along with other information. Set the form so that the info is sent to you through an email. Update the script with the new username and password, and re-upload it on the server. Let the user know that his registration has been approved and he may now loggin in your site.

__________________
Navaldesign
Logger Lite: Low Cost, Customizable, multifeatured Login script
Instant Download Cart: a Powerfull, Customized, in site, DB driven, e-products Cart
DBTechnosystems.com Forms, Databases, Shopping Carts, Instant Download Carts, Loggin Systems and more....
Advanced BlueVoda Form Processor : No coding form processor! Just install and use! Now with built in CAPTCHA!