On a WINDOWS PC:
To take a screen shot on Habbo simply hold down 'Ctrl' & 'Print Screen', then open any paint program, make a new file and press 'Ctrl' & 'V' to paste the image.
On a MAC:
Hold down Shift - Apple (Command)- 3 to take a picture of your screen.
OR
Hold down Shift -Apple (Command)- 4 to take a picture of one window on its own.
The files will be saved to your desktop as Picture 1, 2, 3, 4, etc...