Move your cursor over a color, click to pick it up, then click on a panel. Please note that the colors shown are subject to availability.
In Windows, to send the image from the colorkite page, hit alt+print screen on your keyboard. This copies the active (pop-up) window to the clipboard. You can then paste it directly into an email. You can also paste it into any imaging program, then crop and save to the format of your choice. If you do crop it, please include the palette bar.
On Mac OS X, pressing Command-Shift-3 takes a screenshot of the entire screen, and Command-Shift-4 takes a screenshot of a chosen area of the screen or if you press Space afterwards you can choose a window on the screen to individually screenshot. These images are saved to the desktop, but if you hold down the control key with the rest of the keyboard shortcut, the pictures are copied to the clipboard instead. (from Wikipedia)