Downloads and installs are here:
http://www.pmwiki.org/wiki/PmWiki/Installation
- copied to server
- unzipped
- went to pmwiki.php via a browser
- on server copy docs/sample_config.php to local/config.php
- modified config.php to set up admin password and some other configs that I liked
- added a line to config.php to set a site wide edit password.