Adding a Header Image Slider in Storefront Theme

Hi there,

I am using the StoreFront theme to create this ecommerce shop for my client. I am using StoreFront for the first time. I am not a coder just a novice. Would like you guys to help me add a slider image to my homepage header in place of the existing still images. I have installed Meta Slider Plugin and it works fine else where.

Here is the store :http://www.southindianrestaurant.co.in/

Also, How do I increase the size of the NAV menu text and change the color to something else.

Thanks a lot in advance,

Thanks