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Disable 'Preview Required' for Comments in Drupal 6
By default, Drupal is configured to force anonymous users to preview their comments before posting them. To enable users to post without previewing their comment, you might think you'd access:
Administer > Content Management > Content Settings > Post Settings
Not anymore!
In Drupal 6, the comment preview settings are tied to each content type. Visit:
Administer > Content Management > Content Types at admin/content/types
Select 'edit' next to the content type. For the 'page' content type, you'll end up at:
admin/content/node-type/page
Scroll down to 'comment settings' and change 'preview comment' from Required to Optional. Then click 'Save content type.'

thanks ... this help me a lot
I knew I saw this somewhere. I thought I had lost my mind. :)
...had forgotten where i had seen this earlier, glad your page came up in google !
Same story as the above comments.
Drupal has a very confusing backend hierarchy.
This is probably my LEAST FAVORITE "feature" in Drupal 6. Instead of having one page that allows me to define how comments work all over my site I now have to set it in six different pages. There is such a thing as "too granular."
How can I disable the Preview button from appearing on the screen?
Thanks.
There are a few ways. Any one of these should work:
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