Relocate Primary Navigation Under a section.

Site URL: https://dachshund-blue-pfal.squarespace.com/

Hi Guys, 

My client wants the navigation bar to go under their header image- ive been trying to find a way to move the primary navigation below a section and im having lots of trouble. So i then tried to create a secondary navigation with CSS but am having trouble with that also because the client also wants sub navigation. 

Is there any way i can do this in squarespace?

They want a navigation menu as seen here - https://www.pawstudios.com.au/

And the page i'm creating for them is here - https://dachshund-blue-pfal.squarespace.com/ - Password 'raz'

Thank you. Im so stuck.

Works for a lot of templates, puts the nav bar in the center. 
 #headerNav nav a {
   padding-left: 15px;
   padding-right: 15px;}

Hi. I don't see Navigation. Can you enable it? We can help easier