Judy said:
I've installed CCK 5.x-1.9 -- http://drupal.org/project/cck
You should now see a section for it (content, content type, field group,
...) in admin/build/modules
There's documentation at http://drupal.org/node/101723
Note "Getting Started with CCK" at http://drupal.org/node/162242
I needed to go to admin/build/modules to enable CCK (of course) before editing/adding new content types.