How can I add orange to the highlight colors in MSWord?

I don't want to use Shading and Borders to add orange. I know how to do that. I want orange as a regular highlighting. Why are there three blues, two greens, and two reds, but no orange? Why can't the highlighting use all the font colors?

How can I add orange to the highlight colors in MSWord?
I dont think so you can highlight it with orange as there is no orange color firstly, and secondly there is no option for choosing or making your own color.
Reply:Click on "define custom colors" and there will be another color pallette.