The window on the left here pops up when you are working
in FrontPage and given the option to change colors. To choose one of the
colors in the window on the left you simply just need to click on that
color. But you may want a different color than what is provided on this
palette. Simply click on More Colors and another window will pop up as
shown in the screenshot below.
With
this chart you can either choose one of the colors that are provided by
clicking on the color you like and then clicking ok.
If you know the Hex code for the color you want you can
enter it in the Value: then click OK.
Or choose Custom and the window below will pop up.
To
use this chart first choose the basic color, then in the rainbow box you
can further customize your color by clicking in the box and finding the
color or close to the color you wish. Then finally in the long narrow box
on the far right you can drag the arrow to select the shade you prefer or
you can simply click inside the box and choose the shade you want. Once
you have the color you prefer click OK then click OK again and you will be
back to your original window.
With
this chart you can either choose one of the colors that are provided by
clicking on the color you like and then clicking ok. 
To
use this chart first choose the basic color, then in the rainbow box you
can further customize your color by clicking in the box and finding the
color or close to the color you wish. Then finally in the long narrow box
on the far right you can drag the arrow to select the shade you prefer or
you can simply click inside the box and choose the shade you want. Once
you have the color you prefer click OK then click OK again and you will be
back to your original window.