i am getting the following error, pl. help:

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.

Do what the error tells you. Otherwise ask your host about your MySQL details. (this has been answered numerous times on this forum before...)