After Installation
When you enter the Catalog, you will receive security warnings about the configure.php files and the /zc_install directory.
configure.php files
You will now want to change the permissions on the configure.php files with chmod 644 (or 444 depending on your server...and sometimes setting 444 cannot be done via FTP, in which case use your host's control panel or file manager to set the permissions level.)
These are located in:
/catalog/includes/configure.php
/catalog/admin/includes/configure.php
It would also be a good idea to download a copy of these files to your computer from the server as they have been setup and configured to your server specifications based on the Installation process.
If you have any errors or problems, most of these can be corrected by minor adjustments to these two files.