Keyboard, Commanders category, VoiceOver Utility on Mac
Use the Keyboard pane of the Commanders category in VoiceOver Utility to turn on the Keyboard Commander and assign VoiceOver commands to key combinations you create, which might be easier for you to remember or perform.
To open VoiceOver Utility, press Command-F5 to turn VoiceOver on, then press VO-F8.
Note: VO represents the VoiceOver modifier. See Use the VoiceOver modifier.
Enable Keyboard Commander
Turn on the Keyboard Commander so you can assign VoiceOver commands to keyboard keys.
Click the pop-up menu, then select the key you want to use as the designated Keyboard Commander modifier: Right Option Key, Left Option Key or Both Option Keys.
The key to assign to the VoiceOver command that’s displayed.
Click the pop-up menu, then choose a different command to assign to a key.
Add a key to the list. Type the key, click the Command pop-up menu, then choose a VoiceOver command to assign to the key.
Delete a key from the list.