Hold command and option and hit H twice. If you pull up the help screen by doing the 4 finger double tap, you should be able to just press keys to figure out what's what. On mine, they're the first and fourth keys to the left of the space bar, since the middle 2 function as the escape key.

Here's a table that's super helpful.


http://pauljadam.com/demos/voiceovercommands.html

Can you say which keyboard you have?