For changing Logo go to Theme Options > Header > Logo

For changing size and margin, go to Theme Options > Header > Header >  Logo element

For adding, removing and styling social icons go to Theme Options > Header > Header > Social Icons

And for changing margins go to Theme Options > Header > Top of Header > Social Element

For editing button settings go to Theme Options > Header > Header > Button Element
This Bitcoin is Image Element that have -200px margin button, You can edit Image element and click on Container StyleKit and change margin settings.
This element is Posts Grid Element, For adding or remove more posts, Go to Dashboard > Posts. By editing this element also you can change settings.
This is simple Image Element, You can find it in Theme Options > Footer > Bottom of Footer > Image Element in the right place
For editing or removing Back to Top or Quick Contact items go to Theme Options > Footer > More

Instead Quick Contact also you can create any page and assign it.

This is site Logo, You can find its element in Theme Options > Footer > Top of Footer
For changing Copyright text go to Theme Options > Footer > Bottom of Footer > Icon and Text Element
This is Content Box Element and inside it is Inner Row with 2 columns, Left is Title and Text element and right is Button element. For changing background color of content box, edit it and click on Overall StyleKit.
All of these are Image Elements, Simply you can edit and replace images under General and Hover tabs.
This Testimonials added inside Carousel element, For editing each testimonials hover over them and click on Pen icon to edit. If its hard for you, you can try to edit via Back-end Editor, You can simply find testimonials.
For changing Background image of row, Edit row and under General Tab you can find Parallax image field
For changing Background color of row, Edit row and under Design Tab you can find Background color field
This element is Video Popup, For editing dots background, Edit element and click on Background Layer StyleKit. For changing scroll parallax go to More tab.
These are Counter Element, Simply you can edit each one numbers and styling
This is Stylish List Element that have left border for container and -margin left to items. Dots are icon.
This row is set to Stretch full width and have an extra Class cz_gradient_white_down

You can edit row and set new background color from Design tab and if you don’t want gradient view, Under General tab leave Class field empty.

This is a Content box and inside it there is Image Element, Title Element and Text Element. It mean you can add or remove element inside content box.

For example you can change styling of content box such as border, background, colors, etc.

Under Flip Box tab you can change settings of back box content and styling. For changing background image under Flip Box click on Overall StyleKit

This row is set to Stretch full width and contains Separator Element, You can edit separator and change background or rotate it..
For editing menus items go to Appearance > Menus

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 menus items go to Appearance > Menus

For editing menu navigation settings go to Theme Options > Footer > Top of Footer > Menu Element

And for styling menus go to Theme Options > Footer > Top of Footer > Menu Styles of this Row

For editing mobile header go to Theme Options > Header > Mobile, Tablet Header