Restaurant Child theme

Hi,

Using the Restaurant Child theme with the new Responsive Business theme – but having a couple of issues.

1/ The background image [image with forks] does not show up. Instead it shows the yellow box image in centre of the page used in the Business Directory theme. How do I remove this yellow box and replace it with another background image like the [fork] one used in the restaurant child theme demo?

2/ Also what type [eg .jpg, .png etc] image should I use and what size [pixels] do you recommend so it fills the screen like the [fork] one used in the Restaurant child theme?

3/ And how do I edit the home page search form in the restaurant child theme? I wish to add a Post Code field and just leave the category field? I can access the search edit section on the Home Page setup area – but it does not allow me to edit/change the search fields?

Thank you.