Drupal - How do I enable the WYSIWYG editor on fields?

Click Configure of your CCK field and choose Filtered text (user selects input format) under Text processing. This configuration will show input format selection you need to choose. As long as you configure properly your WYSIWYG module the editor will show.

If you are not wanting to make every single textarea an editor, FCKeditor under Drupal lets you choose exactly which fields will be WYSIWYG editors .. you need to configure (.../admin/settings/fckeditor/default) for "include" mode and list the node-type field IDs. You can even specify a simple vs normal toolbar. Quite flexible

Yes! You can enable the WYSIWYG editor for every field that you add using CCK.

1. Add and enable the WYSIWYG module.
2. Configure the WYSIWYG module. You can use either CK EDITOR or FCK EDITOR.
3. Go to Manage fields under Content types and configure each field. Enable filtered text under Text processing of Global settings.

And you're done!