How to Customize the Mobile Theme?

Hi When the site is viewed in mobile, I get the Site title at the top and then under that it Says Main Navigation and beside it the three nav bars. I would like to get rid of the Main Navigation text and maybe have the 3 bars next to the site title. How would you go about doing this? Here is the link to https://quirktools.com/screenfly/#u=http%3A//www.mekevinwilliams.com&w=320&h=568&a=37

Thanks