Hi @Miranda,
To use the font awesome icons on the site, you would need to add the fonts to the site.
Please login to the admin area and go to “Appearance >> Customize >> Additional CSS” and add the below import statement for Font awesome at the very beginning of the input(generally blank but in case you have added other rules)
@import url("https://your-font-awasome-pro-url");
Once you save this, you should be able to see the fonts rendering in places where you would have used them.
Hope this solves your query.
Thank you
Regards,
Support Team
Promenade Themes