prepopulate - how do I make it work? not even filling the title field

Hello,

I´ve installed the prepopulate module and read quite some comments on it, but I still can´t make it work.

I´ve activated the prepopulate in the content type setting and using the following syntax:
http://www.domain.com/?q=node/add/content_type?edit[title]=testtest

but all it does is loading the page, where you can select which content type you want to create?

Can anyone help please. any ideas?

Thanks a lot

Cheers,
jochen