Header & Footer
In order to control top bar with Social Networks, Phone and Email, please go to Appearance> Widgets> Top Bar 2 and 3.
You have separate settings for the mobile and main menu, so you can control them separately. Some of the styling settings are located in Theme Settings> Menu Settings and other can be controlled as Widgets (Appearance> Widgets> Mobile Menu). Megamenu items won't show up in the mobile menu, only main links and dropdowns.
To find some general settings go to Appearance > Theme Settings > Logo Header Settings tab.
You can place widgets in footer by going to Appearance > Widgets. Find Footer 1, 2, 3, 4 zones and place widgets inside them.