I am following your post because I need the answer to your question too.
You must do some changes to your style.css file, also to your header.php file.
Change to your style.css (keep a backup anyway) I note only the changes…
body {
max-width:100%;
width:100%;
}
div# container {
width:1150px;
margin:0 auto;
}
/*————————————————————–
ADD THIS
————————————————————–*/
#header-in {
width:1150px;
margin:0 auto;
}
Now open your header.php file.
after the head>
make this
<div id="header-in" onclick="location.href='http://www.yourdomain.com/';" style="cursor: pointer;">
false, 'menu_id' => 'nav', 'theme_location' => 'primary', 'fallback_cb' => 'bp_dtheme_main_nav' ) ); ?>
To change the navigation align go to style.css and change this
#navigation {
position: relative;
text-align: left;
}
This way it works for me. I am not sure that is the best way. Just try it.