You got to "insert" and then you go to "shapes" and then you find the symbol you like and you drag and drop it onto the page. Then you can resize to the size and angle you would like it at.
Goto settings>display>resolution what os is your system? this was for a win 10
Presentation software is probably his best option. It would allow him to present visual and audio supplements to his audience.
Boolean operators it is
all the best