Er.. What do i do?

Okay, i was trying to install this gallery on my site… but then this came up:

[font=Courier New]Unix with shell access
% cd /path/to/your/gallery
% sh ./secure.sh

Unix with FTP access
ftp> chmod 644 .htaccess
ftp> chmod 644 config.php
ftp> chmod 400 setup [/font]

What in the world am i supposed to do?

I tried to change the chmod of setup (folder) to 400, but it became 755 instead. And how do i do that shell access thingie?

This server stuff is so confusing :S