How do I place logo and header navigation on same line using bigcommerce cornerstone stencil theme?

using the Cornerstone theme and have left aligned my logo and header navigation. How do I place them both on the same line? paste below css into footer script [css] [/css]

I am using and would like to remove (or comment out) the Categories in my footer.

Where do I find footer.html to modify bigcommerce Cornerstone Light footer?