Sorry, gang - despite your advice, I'm still having trouble coloring in Xara.

Here is a drawing I've outlined with Xara. I'd like the areas outlined in purple to be filled with a lighter shade of purple (how do you lighten a chosen color in Xara?), the areas outlined in deep yellow to be a lighter shade (pastel yellow, actually) and so on:

toonposelast 001.jpg.xar

Please, if some kind person will color this image and tell me every step he/she took, and please be explicit because I am very new to Xara, I would be very grateful. I tried to color this using the shape tool, using the put to back control, etc. Nothing happened. I must still be doing something wrong, but I don't know what. Please help. Thanks!