Or in your site front page, in the admin bar find Edit Page ( Back-end Editor ) or Edit with WPBakery Page Builder ( Front-end Editor )
For changing size and margin, go to Theme Options > Header > Header > Logo element
For disabling slider or changing it with other title types
Example Breadcrumbs or Title, Go to Page Edit > Page Settings > Title Type
For overall website title type go to Theme Options > Title & Bredcrumbs
You can assigned it to all pages in Theme Options > Footer > Footer top bar
If you want to add/edit Posts, Go to Dashboard > Posts
You can edit Carousel settings in its edit settings and change the Service Box from their edit.
You can edit Carousel settings in its edit settings and change the Quote from their edit.
Instead Quick Contact also you can create any page and assign it.
In widgets find Footer 1 area section and edit it.
For changing background of Footer, Go to Theme Options > Footer > Footer Widgets > Container Style Kit
This is Title & Text element, you can find it in Page Builder and edit it.
This is Title & Text element, you can find it in Page Builder and edit it.
You can find the 3 dots icon in Shape tab of this element and change or modify it.
For background green dots you click on Background Layer stylekit and change it.
For editing menu navigation settings go to Theme Options > Header > Header > Menu Element
And for styling menus go to Theme Options > Header > Header > Menu Styles of this Row
For editing menu navigation settings go to Theme Options > Header > Header > Menu Element
And for styling menus go to Theme Options > Header > Header > Menu Styles of this Row