1. After using Tools, Library or the Command Box to navigate to the Hebrew Cantillations Interactive, click on Help to see the documentation.

2. Closing the Help window, you can see the cantillation diagrams. Given that I do not read Hebrew nor do I have more than introductory knowledge of Hebrew chant, you now know as much or more than I do about using this feature.

I can give you the web link to Hebrew Cantillation Marks And Their Encoding by Helmut Richter mentioned in the documentation. Or if you would like to learn to chant the Hebrew see LearnTrope.com or from the Reading List "Logos/Verbum dataset and visualization information" there are additional links showing the actual use in interpretation of the text.
Hebrew cantillations
If someone who knows what they are talking about would like to chime in, it would be appreciated.