Zenphoto Error
MySQL Error: Zenphoto could not connect to the database server.Check your zp-config.php file for the correct host, user name, and password.Note that you may need to change the host from localhost if your web server uses a separate MySQL server, which is common in large shared hosting environments like Dreamhost and GoDaddy.Also make sure the server is running, if you control it.

I think I need to change my host name user name and password. I'm not sure the best way to accomplish this. Any help greatly appreciated.

As the message says edit your config file which is located in /zp-data.

You are probably using an older Zenphoto version if it is really named "zp-config.php-