I purchased this phone on eBay and it came with the iPhone theme preinstalled and I can't change the icons on the desktop. There's only 2 items in the top section and I know I can have 3. And along the bottom there's a few applications that I don't use regularly. I tried moving my most frequently used apps to the top of my list by using the drop-down box and "move" but when I go back to the home screen, nothing has changed.
The theme you linked me to shows you can customize the bottom 7 icons. But I dont think so for the top 3. I wonder if you have a theme that is similar to this one?