Change the administrator login & password in config.php
You can edit you root name directory too, If you install it in a mywebftp directory located in the base directory, just leave it to ".." ( one level below ), of configure it to anything you want, users and yourself won't be able to reach lower directories from the one you choose as root. The root directory will be customisable for each user, as soon as the user administration is available
Upload MyWebFTP directory to your base directory. assuming /www/ is the base directory, create a /www/mywebftp and upload in it - The directory name has no importance.
Surf to http://yourwebsite.com/mywebftp to use it. Log in.
Requirements
Web server with PHP&MYSQL on it. It must allow you to upload files and write in local files.