I need to change Navigation Menu to be below my logo

Hi,

This is my site —> https://www.proresco.three60mktg.com/

1) I need to change the current position of the navigation bar which is beside the logo to be placed below the logo to be as same width as the slide frame.

2)The slide Show i want it to be full width for the image i upload..

3)I need to add thumbnail images for the first 3 posts.

Pls advise as Im using elegant themes Foxy theme.. and I have no idea how to change it as i tried both css and header.php.

Pls advise. Very Urgent and Crucial