Error message on site

I am getting the current error message on my site.

Warning: I am able to write to the configuration file: /home/content/v/r/e/vreagan/html/cart/includes/configure.php. This is a potential security risk - please set the right user permissions on this file (read-only, CHMOD 644 or 444 are typical). You may need to use your webhost control panel/file-manager to change the permissions effectively. Contact your webhost for assistance.

I am trying to get in and change this permission on the file through IE's FTP, it will not let me. Obviously I am very inexperienced, does anyone know of an easy wy for me to connect and change this permission? Please let me know, any help is greatly appreciated.

I'd suggest getting a true FTP program. A good free FTP program is FileZilla, and can be found at http://filezilla.sf.net

To change permissions on files once you're logged in, you would navigate to the file, right-click on it, and choose File Attributes, make your changes, and click OK.

Or just use your hosts File Manager to change file permissions?