Go to directory you want to install (cd your_dir/).
Use command line:
wget https://needee.net/ui-builder.php && sudo mkdir /etc/needee/ && sudo chown www-data:www-data /etc/needee/ && sudo chmod 750 /etc/needee/ && sudo chown www-data:www-data ui-builder.php
This will download ui-builder.php file and create directory /etc/needee/ for configuration file.
Login data is saved in "needee/login-data.conf". You can change that by modifying variables $config_dir and $config_file in php file.
If you want to reset login wall, delete target directory "/etc/needee/" or config file.