WordPress.org

Any technical requirements?

• You will need PHP5. PHP4 has been officially discontinued since August 8 2008. If this plugin gives you PHP errors (TSTATIC, TOLD_FUNCTION), you should strongly consider upgrading your PHP installation.
• You will also need at least WordPress 2.7 since WP-prettyphoto is using (as of version 1.4) WordPress' Settings API.

How do I use it?

See the plugin's documentation, prettyPhoto's project page and prettyPhoto's support forums.