Welcome to the Instant Update. Whole script is located in manage/ directory. When you enter this folder first time, installation will begin. After successful installation please delete manage/install/ directory and next time you enter manage/ directory you will be able to log in and manage your site.
Your first task is to convert this page to IU format so you can edit this page from within website.
For documentation see manage/docs/
Regards,
Webinsane team