This is extremely common when dealing with non-English fonts in an English version of InDesign.
First of all, I need to say: I have no idea why Barbara Ash would recommend changing something in the export PDF dialog box. This has nothing to do with that.
The issue is that there are fonts and then there is how text is encoded. It's a little hard to explain… There are a few things you can try. In general, copy and paste from Word or most other programs doesn't work very well. However, you might try to import the text from a web browser. I explained this weird trick in this article a while back: https://indesignsecrets.com/typesetting-hebrew-and-other-languages-in-english-indesign.php
If you're trying to type directly in InDesign, you're going to want to set the font first, and then you need to make sure you're typing using a Hebrew keyboard input encoding in your operating system. You may also need a tool such as World Tools from in-tools.com so that InDesign can handle right to left and so on.