Here you can paste the code of the icon.
The code for the icons can be found here: https://fontawesome.com/v5.15/icons
When you have selected an icon, click on the icon.
Then click on the code icon, as shown in the image below.
Now go to your theme settings, click on it and press ctrl + V.
The icon’s code is now pasted in the text box.
Enter the text of the usp here.