I figured it out!
These files (found in cpanel) have to be customized:
social-icons.php
edge-functions.php
(Just duplicate what’s there and modify to specify what’s needed)
Then add the following (as per your needs) to the Stylesheet CSS:
.social-links a[href*=”youtube.com”]:hover {
background-color: #CB2027;
color: #FFF;
}