I'm trying to center the horizontal menu bar. I've tried, in Add HTML/CSS Inserts:
div#menu1 ul.rMenu {margin: 0 auto;}
Didn't work.
Also tried adding fixed width, which worked, but would need to be adjusted each time a menu item is added or deleted. Currently, I'm using div#menu1 ul.rMenu {margin-left: 202px;}, but this is pretty crude solution.
Any suggestions?

did you look at the 'Configure Header Area' options?

So sorry. Yes, I missed the %page-center option. All set. Love the theme. Use it all the time.