You can find all the properties to adjust in the style.css file:

See the table of contents under this section:
13. NAVIGATION STYLES

Yes I've been looking all through that section but sorry to say I'm too much of a noob. I've seen a couple of mentions of 'width' and 'padding' but no matter what values I plug in to them there's no change in the width of the nav bar or the buttons. Could you point me to a specific place? I'd really appreciate it.

The navigation-wide-dark is:
/* -------------------- 4a. WIDE NAVIGATION SKIN -------------------- */

The main padding for instance is:
#navigation-wide-dark .sf-menu a {
padding:16px 38px 15px 38px;
background:url(images/navigation-narrow-dark-hover.png) top right no-repeat;
text-decoration:none;
}

Note: Make sure when you make an adjustment, it actually works. Sometimes the WordPress Editor is blocked by your hosting provider from making updates. In that case ou would need to upload the style.css file via FTP.


I'm happy to provide you with a quote on development if you need additional help.

4a. wide navigation skin was the place. thanks very much, Mike.

And I will keep in mind your offer of additional help. Thanks.