You can open the "Scripts" window by clicking the All scripts button in the Script group of the Advanced tab. This dialog shows a list of scripts which have been added for usage within the editor.
Click the Add button to open an explorer window allowing you to browse and select one a JavaScript file (*.js) to be added to the list. You can also enter a short description in the Script Description field to be shown in the "Scripts" window. For scripts that have already been added to the list, double-click on the "Description" field at the bottom of the dialog to edit it.
Select a script and click the Edit button to open that script for editing.
To remove a script from the list, select it and click the Remove button. The selected script will be removed from the list, but not deleted from the system.
Hovering the cursor over a script name will cause the full path to the script to be displayed in a tooltip.
Within the list of scripts, you can click in the "Hotkey" or "Chord" field to type a keyboard shortuct directly in this field to be used to invoke the script.