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If you want to use extra social icons in Helix templates, you can use Custom field for it.
You need to add the fontawesome class<space>social link
Example: fa-instagram https://instagram.com
If you want to add more than one social icons, then you need to use any of the default icon and use custom CSS.
For example, to change Dribble icon to Github, you need this CSS
.fa-dribbble::before {
content: "\f09b";
}
Note: Path towards custom CSS(Joomla 4): System>Site Templates Styles> Click on your current default template name then choose Template Options. Then find custom CSS within the custom code.
https://prnt.sc/5mBuSRh907N3
https://prnt.sc/ooiq-lkMEXr_
https://prnt.sc/nunlX-f5AhK1
The following may help too: https://www.youtube.com/watch?v=8dpCfEnvLts
Best Regards