Menu icons problems

Hey guys, i have recently started using wordpress as a blogging system and got a problem which i can not solve for 2 days. No help from the net or youtube.

I am trying to insert custom icons right before my menu using the standard: “Image” label in menu settings as seen on this screenshot:
https://imageshack.us/photo/my-images/593/54984392.jpg/

And still there are no icons before the menu item as you see on home page https://seotweak.ru