Find it: Click the Script Editor button on the Action
palette: 
Here's an example of how to create a simple script. With this script,
when the user clicks the cone in the scene, it doubles in size.
This example uses the Script Editor
to create the script, the Trigger Creator to create a touch sensor,
and the Outline Editor script to
the cone.
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In the main window, create a cone. Select the cone.
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To create the script, click the Create Local button and type
a name for the script. This action associates your script with the
cone. If the cone is cut and pasted into a new location, your script
will follow along with it.
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Create the trigger sensor that will activate the script. Click the Create
Trigger button and choose Touch sensor. This action adds
a new eventIn called startTime to the script. It also
creates a touch sensor and routes it to the startTime event.
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Add the outScale eventOut event to your script using Field
> Add. (You can also add fields and events directly using
the text editor in step 5.)
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Click the Edit Script button. The default text editor
appears with a template for your script. (Click
here to view script at this point.)
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Fill in the rest of the code for the startTime() function,
which scales the object by 2 in all directions. The outScale
eventOut is of type SFVec3f.
(Click here to view finished script.)
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Save the script. Then check its syntax by clicking the Parse
Script button in the Script Editor. Be sure to save the script
before you exit the text editor.
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Open the Outline Editor. Create a route from
the outScale eventOut of the Script node to the scale
field of the Transform node that contains the cone.
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