Vertical menu instead of horizontal

I've just installed the template on Joomla 3.3, and the menu on user3 shows vertical instead of horizontal, as shown on the demo.
Please see the link studisciamanici.it/index.php
Thank you for your support.

Did you install template using HotStart installation method?

Only in this case you will get exact copy of oue demo site.

Regards

No, I'm sorry. I installed only the template. I followed the instruction as describe in 'Change Joomla Template on Existing Website', even if the explanation of 'Joomla Top Menu Settings' doesn't match with joomla 3.3
Attached there is the setting of the main menu.
If there is no chance I could install the website again with sample data, but it would much easier to use the template without reinstall everything.
Thank you for your assistance.

the screen picture

Ok, solved! menu module settings set Menu Tag ID = nav