Colors
You will notice that Adobe Illustrator provides you with some basic colors
already in the color swatch (if the swatches window is not visible, choose Window
→ Show swatches from the menu bar). However, it is possible to
add more colors to the swatch by using the Color window. You
may change the type of color by clicking on the arrow in the upper right hand
corner of the color window and choosing Grayscale, RGB, HSB, CMYK, or
Web Safe RGB. You may then edit the colors by using the sliding bars,
changing the numbers in the boxes, or by clicking on the color spectrum at the
bottom of the window. Once you have your desired color, click on the New
Swatch button on the bottom of the swatches window. The color is now
available on the color swatch for you to use throughout your document.