Where is the ".. prepopulate checkbox in admin/content/types > .."

Hi there

Looks like a great module and have instaled and started playing - but with no luck :-(

In the INSTALL file it says

"For each content type that you want to allow prepopulating, set the prepopulate checkbox in admin/content/types > edit." ,

but I can't find this checkbox any any content type?

I must be missing the point but where is it?

Thanks

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