Hello,
Please open the program, load the file you are going to work with, then please click on the ¨Tools¨ tab at the top of the program window. Then please click on the ¨Tools¨ icon on the toolbar and from the options displayed please select ¨Embroidery¨ , now to the right of your screen you should have the ¨Effects and Layers¨ menu under ¨Embroidery¨ you will see the options ¨Colors¨ and ¨Stitches¨ here you can change the amount of colors and stitches you will be using on the file.
Good Luck!