add new buttons and icons for social networks

Good day!
How to add new buttons and icons for social networks? Or change existing to new?
Vk – fa-vk []
Od – ? fa-odnoklassniki []
I added code for this tutorial https://presscustomizr.com/snippet/add-new-custom-socials-icons/

I uploaded the child theme via FTP – customizrPG
But the icons of social networks Vk Od has not appeared.
How to cope with this problem?
Please help! https://поколение-гениев.рф