When creating or editing a form, you can add a custom script or a custom style. To add a custom script or custom style, click RESOURCES in the Toolbar. A new window opens, showing two lists in the Schematic panel. One list is for your existing scripts and one list is for your styles.
In the list you can either edit or delete the specified style or script. You can also filter the list.
You can create new ones by clicking NEW and then choose which type to create.