Please follow Theme Options -> General -> Appearance -> Layout -> Background under the box -> Remove an image -> Save
Icons can be assigned via Appearance -> Menus -> Click on a single menu item -> “Icon” property.
Please follow Theme Options -> General -> Appearance -> Layout -> Content width -> Enter the desired site width in pixels or percentages -> Save
Please follow Theme Options -> Page titles -> Breadcrumbs -> Disable -> Save
You are able to create as many slideshows as you want and use them on any page or post.
Yes, you can ad widget areas with the help of Widgetised Sidebar shortcode.
Please follow Theme Options -> General -> Footer & Bottom Bar -> Footer -> Footer Layout -> Layout -> Enter the desired footer structure, f.e. 1/2+1/4+1/4 -> Save
The notice about Slider Revolution registration is a suggestion, not a requirement.
The plugin is registered on Dream-Theme, and buyers of this theme do not need to register it once again. So, for now, could you please simply disregard the notice.
There are 50px gaps between header and content area, content area and footer. You can add negative top and bottom margins (-50) in Visual Composer row setting to remove these gaps.