Hello,
Joomla! site templates contain predefined positions for loading modules. You can see this positions if add "tp=1" variable to site URL. For example if your site has URL
www.domain.com use the next URL that see module positions:
www.domain.com/index.php?tp=1
That assign a module to necessary position, open 'Extensions -> Module Manager' page on Joomla! backend, click by 'ARI Ext Menu' link in modules data grid, configure it, choose position in 'Position:' drop-down, enable and save it. After this the module should appear on the site in selected module position.
Regards,
ARI Soft