What you do is just go in your album and there is a sticker bar and put the star on your favorite pic. Then you go to your dsi menu and walla there it is. I know this because I have a dsi of my own. Enjoy;)
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In your photo album, select the star marker for any pictures you want to be displayed on the top screen in the DSi Menu.
you have to go to settings then go over once press profile then click on color you put your favorite color in to change your color if you are not satisfied. No, this is how you just change the color. To change the actual WALLPAPER, you have to take a picture of whatever you want as the wallpaper. then make sure its saved on the CONSOLE memory and not just an sd card. find the picture in the album and choose the star stamp. whatever pictures have the star stamp on them will rotate as your wallpaper pictures.
When you are in the Nintendo DSi Menu, Press either L or R to take a picture or Go into Nintendo DSi Camera and tap the button on the touch screen that shows Take Picture.
go to your photos and click display
Do a System Update from the Start menu!