that is correct. I can get the question icon next to the General category - but nothing else. They are not in FA format - so how do I see a list of icons that I can select (along with their code)?
Once added in the icons section - what needs to go in SVG bit??
If I want to add this FA icon for example - how would you do this??
It is very strange that you dont add an icon in the relevant category section (where you assign images!), but in a them plugin. But Im hoping this is just a learning curve as a new user 
The documentation assumes that you know things like that