Enter Mission Control by pressing Control-Up Arrow.
To exit Mission Control without doing anything, press the keys again.
In Mission Control, do any of the following:
To open an item in a window group, press VO-Left Arrow or VO-Right Arrow to navigate to the group, press VO-Shift-Down Arrow to interact with it, navigate to the window, then press VO-Space bar.
To open an item in the spaces list, press VO-Left Arrow or VO-Right Arrow to navigate to the list, press VO-Shift-Down Arrow to interact with it, navigate to the item, then press VO-Space bar.
To create a desktop space, press VO-Left Arrow or VO-Right Arrow to navigate to the Add Desktop button in the spaces list, then press VO-Space bar.
To remove a desktop space, press VO-Left Arrow or VO-Right Arrow to navigate to the spaces list, press VO-Shift-Down Arrow to interact with it, navigate to the space, then press VO-Command-Escape. Press Return to confirm.
You can easily move between desktops while you’re working—just press Control-Right Arrow or Control-Left Arrow.