The CSS and Javascript editors are located in the control panel on the builder. You can add multiple scripts to any page.
If you’re adding a script to a specific widget, you’ll need the widget ID and Class. Select a widget and the ID and class can be found in the bottom right hand corner of the builder.
To add or edit a script, open the drawer. Name the script and type or paste in the code. If you’re adding Javascript, use the placement dropdown to make sure the snippet is placed correctly on the page.