From the menu Edit → Install script.

This allow to get script example you can use directly or customize.

Select the row with the script you want and click Download.
The script is installed and it open in the editor.

The script packages, recognizable with the “.pkg” in the name, install a group of script for related task.
If there is a configuration file for this group it is opened after the installation.
The configuration file is preserved by an upgrade of the script package, you can just install the package again to get the new version.