Check out my comment here – https://appfinite.com/topic/logon-inover-nav-bar/#post-3613
There are a lot of other posts that you can search for here in the forums that already explain how it works. The link above explains the basics. Nick croft also has a plugin that may help that you could try if you want – http://designsbynickthegeek.com/plugins/genesis-responsive-header
I create awesome sites for awesome people! Contact me if interested – ericsanchez1585@gmail.com