How to get more icons from fontawesome

Hi I can’t manage to find how to add more icons from fontawesome (or any other place I dont care, but hestia recommends that). It says that: Note: Some icons may not be displayed here. You can see the full list of icons at fontawesome.io/icons . But I don’t know how to add those icons from there to my site. I donwloaded the fontawesome plugin but didn’t notice anything change.