This file contains right sidebar. It is disabled by default, remove lines 11 (if false) and 41 (endif) to enable it. Edit it as text file, not as HTML because WYSIWYG editors (such as Dreamweaver) tend to mess up phpBB template syntax. After changing this file and uploading it on server, open your forum in browser, go to admin control panel and click "purge cache" button on control panel index.

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