Hello,
Thank you very much for choosing our theme and for contacting us.
Please check Dashboard > Settings > General > site URL: if your site is https://… it should be the same URL there.
You can set the colors of the buttons in the Theme Settings > Styles and colors.
As for the SVG icons: you need to open your SVG icons file with some editor like Sublime Text or default system text editor and add width=”31″ height=”40″ attributes to your <svg>
tag like it is shown: http://prntscr.com/m4n0qw
Then you will need to re-upload your icons in WordPress Dashboard.
Best Regards