How to Exclude Pages from the WordPress Navigation Bar
1.Download Exclude Pages plugin from http://wordpress.org/extend/plugins/exclude-pages/.
2.upload this plugin to www.yoursite.com\wp-content\plugins\ folder.
3.Login to wp-admin.In your admin dashboard click plugins and activate the exclude pages plugin.
4.Then choose the page which you want to exclude.
5.Uncheck Include this page in user menu