4. Save this document under "Library/TeXShop/Engines/" in your home folder and name it "ConTeXt Minimals.engine".
4a. chmod +x the "ConTeXt Minimals" file.
5. Close all open documents in TeXShop, open a new one and select "ConTeXt Minimals" in the list next to the "Typeset" button in the toolbar. This will instruct TeXShop to use this engine to compose your documents.