Download the tar file, and place it in your webtree. For the purposes of this tutorial, my wiki will sit in the root directory of the greenman.co.za server. Extract the file:
tar -zxvf phpwiki-1.3.12p1.tar.gz
Renaming the directory from phpwiki-1.3.12 to simply phpwiki, or even just wiki.
mv phpwiki-1.3.12p1 wiki
You can now access your wiki from a browser: http://greenman.co.za/wiki
. Before you can do any editing, you'll first have to configure everything.