I'm not sure what you mean by font colors. If you mean custom defined text fonts, you can set the color when it is defined or let it take on the "active color" being used when it is placed in the pattern.
As for the stitch symbols, there is a place when you select a single symbol to set its color. Look near the top of the symbol panel for that.
However, that appears to be only the active color. Changing, permanently, symbols to other colors doesn't seem to be available.
Please explain more just what you are trying to do.
If you're referring to a pre-defined font, it uses the active color. To type the text in the color you wish, just select that color as the active color and type.
If you want to change the color, select the text and then select a new color.