No styling or CSS seems to be applied to Ninjaboard.You possibly have a SEF issue (known Nooku bug)
Goto your control panel/file manager provided by your host
• find htaccess.txt (found in the root of your Joomla! installation), copy and rename it to .htaccess
• when done go to Joomla's Global Configuration and under SEO Settings set Search Engine Friendly URLs to No and set Use Apache mod_rewrite to Yes.