1.)Download the latest version of zenphoto from zenphoto.org.
2.)Extract the contents of the archive to your web directory.
3.)Edit the [zp-root]/zen/zp-config.php file to meet your requirements.
3A.)This includes your database username, password, name, host and table prefix.
3B.)If your server DOESN'T support modrewrite, set it to false(true is default).
3C.)MAKE SURE YOU CHANGE YOUR ADMIN PASSWORD!!!!.
4.)If your server DOES support modrewrite, edit your .htaccess file to reflect the correct rewrite base. EXAMPLE: www.zenphoto.org/gallery -> RewriteBase /gallery
5.)Make sure your server permissions on the album and cache folder are writeable by the webserver(chmod777)
6.)Navigate to the setup url EXAMPLE: www.zenphoto.org/gallery/zen/setup.php
7.)Type in the username and password you set in the zp-config.php.
8.)Follow the instructions(basically hit next)
9.)Upload photos through either the admin section or via FTP into the albums folder.
10.)ENJOY!
IF PICUTURES DO NOT SHOW UP TRY EACH ONE OF THESE ONE AT A TIME!!!
Ensure albums and cache folders are writable by the web server.
Make sure you are using php 4.1.0 or newer and mySQL 4 or greater.
Change modrewrite to false in zp-config.php.
Modify SERVERPATH and WEBPATH in zp-config.php
If it still doesn't work or you are receiving errors.. post back here on the forums
As theme customization tips. Without getting too in detail, open up template-functions.php in the [zp-root]/zen/ directory. It is commented pretty well. You should be able to get going with what is in there. If you need more help, come back here.