centering menu

You’ll most likely need to edit the CSS.

On twentyeleven there are several changes you’d need to make.

What theme are you using?

Off the top of my head you’ll want to add a width and margin to your nav.

So for twentyeleven find

#Access ul{
width: 960px;
Margin:0 auto;
}

As I said, it’ll vary depending on how your theme is coded.

Got a link?