To make sure that Compiz Fusion is enabled, go to System > Preferences > Appearance:
In the Appearance Preferences window, go to the Visual Effects tab and make sure that Custom is selected. That's it already. To configure Compiz Fusion, you can click on the Preferences button...
... but you can do the same by going to System > Preferences > Advanced Desktop Effects Settings:
In both cases the CompizConfig Settings Manager opens where you can define the behaviour of Compiz Fusion:
5 Keyboard Shortcuts
Here's a list of the most common Compiz Fusion keyboard shortcuts:
SUPER+SHIFT+DRAG LEFT MOUSE = draw fire SUPER+SHIFT+C = clear fire CTRL+ALT+DRAG LEFT MOUSE = rotate cube CTRL+ALT+LEFT ARROW = rotate cube CTRL+ALT+DOWN ARROW = flat desktop SHIFT+ALT+UP = initiate window picker CTRL+ALT+DOWN = unfold cube ALT+TAB = window switch SUPER+TAB = flip switcher or ring switcher, depending on which is enabled. ALT+F7 = initiate 'move windows' SHIFT+F9 = water effect SHIFT+F10 = slow animations CTRL+ALT+D = show desktop
For Grouping and Tabbing: SUPER+S = select single window SUPER+T = tab group SUPER+Left = change left tab SUPER+Right = change right tab SUPER+G = group windows SUPER+U = ungroup windows SUPER+R = remove group window SUPER+C = close group SUPER+X = ignore group
Hold the SUPER button then select the windows you want to group and then hit SUPER+G.
The SUPER key is the Windows key on most keyboards.
6 Some Screenshots
Here are some screenshots of Compiz Fusion in action: