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If you want to get rid of the Big Button for new discussion and put it in the menu,
Put this link in your master.default.php from the views folder of your theme where the other links are, I put this under the Activity Link:
$this->Menu->AddLink('New Discussion',T('New Discussion'),'/post/discussion', array('Garden.SignIn.Allow'), array(), array('target' => '_blank'));
Then put this in the custom.css for your theme: