Hi, go to your project directory, next go to theme/web and edit the settings.json file. Add the link to the ICOMOON to the array. Save the file and compile the project.
Example below:
Mendix pages and widgets on those pages are (dynamically) loaded in the <body> of the HTML. If you want to add something to the <head> you need to do it in the HTML files
go to your project folder theme\web\index.html
and change the html file