Help with menu!!!

hi guys, I am very new using wordpress trying to build my own website.
I am using the Blaskan 2.2.1 theme and I have been trying all day trying to center the menu bar.

this is my link http://salvonostrato.com/WP/

I found the way to center the header using <div align=”center”> but I cannot find where to use this code for the menu bar.. please helppp

Anyone knows how to do it?