Hey KF,
I will go over your questions in the same order:
1). The “See the demo” button is generated using a [BUTTON] shortcode; the full code from the demo is as follows:
[button link="https://satoristudio.net/kanso-multipage/" size="8" color="#ffffff" style="1" dark="0" radius="0" target="blank"]See the demo ›[/button]
2). The top social icons can be configured in the “Header Social Icons” tab of the Theme Options panel ;)
Sincerely,
Andrii / Satori Studio