Ok changing your WAD3 Theme is simple. You need to navigate on your device Start Menu/Settings/Theme Manager and once the theme manager opens your prompted to select a function to customize, Simply choose desktop. You should now see a list on default installed themes. Choose one of them and click ok, but if you want to build your own theme then select new and enter a name for it and click ok. You should now see the list of installed themes again but with your newly created theme populated in the list of installed themes. Select the theme you just created and click ok. You should now have a blank royal blue screen or a blank screen with only your device's default wallpaper. You can now began designing your desktop theme. Here is a
tutorial I did with WAD2, but the proceedure is the same for WAD3. You can also try the forum at the developer's home site
Lakeridge Software for additional assistance. Good luck and if I helped dont forget to thank me here in the forum.