Thank you for your post.
On both Windows and Mac, the script box does not have a save button. You can either pull down the Scripts menu and select "Save Script" or press ctrl-S to save, or close the box and then select save. To cancel, select "Don't save" when you close the box. At this time, there is no buttons available to click.
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I could easily copy and paste this information for you, but there are questions asked that only you can answer.