Wallpaper

To change the wallpaper, first open the "SYSTEM" window and press the "TL-MENU" or "OPTIONS" button (depending on which theme you're using).

Now in the page menu, if not already in edit mode, tap the lock icon.

Then press the little image icon in the corner of the preview screen to get the "Background" menu.

Tap the Portrait and Landscape images and select Reset in the menu.

Now the background can be set with your system wallpaper.

For the New Trek Total Launcher theme, there are full screen images in the background. In edit mode long press anything, then use the arrow buttons on the bottom menu bar to change which item is selected. When you get to that image, press the button on the bottom menu that will bring it to the foreground. You can delete it, or if it's not a solid image, send it back to the background. Once you delete the solid image, you'll be able to see your system wallpaper.

If you have the New Trek style, here is a much nicer animated wallpaper for users of KLWP (but KLWP requires the paid version to apply it)

https://play.google.com/store/apps/details?id=com.nstenterprises.trekklwp