Where are the content parameters in Joomla! 1.5?
From Joomla! Documentation
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In Joomla! 1.5, the content parameters are not in the global configuration anymore. Joomla! 1.5 provides component specific settings, which are not set in a global configuration screen for each component itself. For Articles, select Content / Article Manager and press the "Parameters" button in the toolbar. For Banners, Contacts, News Feeds, and Web Links, select the desired component from the Components menu and press the "Parameters" button in the toolbar.