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The screen shot below should have all that information.  Sorry for the slow response—I was travellinng this weekend.
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<div class=""><img height="457" width="812" apple-width="yes" apple-height="yes" apple-inline="yes" id="A2893EF6-E833-4B09-AABF-B80FE532F9BA" src="cid:FAAC7E07-91C3-4CB7-BD1C-4941739CB6C8@tufts.edu" class=""><br class="">
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Zbigniew Nitecki<br class="">
Department of Mathematics<br class="">
Tufts University<br class="">
Medford, MA 02155<br class="">
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telephones:<br class="">
my office     (617) 627-3843<br class="">
dept. off.    (617) 627-3234<br class="">
dept. fax    (617) 627-3966<br class="">
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<a href="http://sites.tufts.edu/znitecki/" class="">http://sites.tufts.edu/znitecki/</a></div>
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<div class="">On Oct 19, 2018, at 11:57 AM, Herbert Schulz <<a href="mailto:herbs@wideopenwest.com" class="">herbs@wideopenwest.com</a>> wrote:</div>
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<blockquote type="cite" class="">On Oct 19, 2018, at 10:39 AM, Nitecki, Zbigniew H. <<a href="mailto:Zbigniew.Nitecki@tufts.edu" class="">Zbigniew.Nitecki@tufts.edu</a>> wrote:<br class="">
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On (1), thanks , now I understand.<br class="">
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On (2), it returns “\RequirePackage{\pst@ColorPackage}<br class="">
I am using TeCShop Version 3.87<br class="">
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Howdy,<br class="">
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I think you misunderstood item 2. You need to open the Terminal application which is in the Utilities folder (Shft-Cmd-U in Finder). Then type the line<br class="">
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kpsewhich shellesc.sty<br class="">
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in the Terminal window and press return (you can Copy/Paste it from the email if you wish). It should return a line like<br class="">
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/usr/local/texlive/2018/texmf-dist/tex/latex/tools/shellesc.sty<br class="">
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if it is found, otherwise nothing (and a new prompt for a command will come up).<br class="">
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I'm trying to determine is you actually are missing the file.<br class="">
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One more thing... let me know what the Path setting for (pdf)TeX is in the Engine tab of TeXShop->Preferences menu item.<br class="">
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Good Luck,<br class="">
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Herb Schulz<br class="">
(herbs at wideopenwest dot com)<br class="">
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