As I expected it is a Hori article which is good, 'cause I also have and use a lot of their stuff. The pictures where just the right size. Just to be sure I translated everything worthwhile so you know what to do when the time comes. On to the translation.
The first page is small chitchat on the "what to," and "what not to do" with: the protect case, the touch pen, top lcd and lower touch screen, and using other items. So I'll just leave it at that unless you wish to know. ;-)
How to insert the DS lite:
First two pictures tell you how to insert the DS lite: the encircled spots are the hooks that will hold your DS lite in place.
How to take out the DS lite:
1) Open the DS lite to an 180 degree angle (this is standard for most if not all Hori and Capdase protect cases)
2) As illustrated, press the protect case slightly down in the middle so a slight opening will form between the DS Lite and the protect case. While unfastening the top hooks raise the upper DS lite panel.
3) Unfasten the bottom hooks and as lift the upper panel you should be able to easily detach the lower half of the unit.
About the long touch pen:
Nothing special just that it can extend and be used like any other DS lite touch pen.
How to use the touch pen attachment:
A customizable attachment to extend and thicken the touch pen. As easy to use a writing accessory, and easy to write with.
1) Make sure the hooked part will eventually hook into the opening as illustrated.
2) The same goes for the front end make sure the hooked part is lined up with the opening as you slide them together.
3) Finish
How to detach the touch pen attachment:
* While pressing the hooked part, see arrow near the encircled 1 pull out the front end.
* Pull out the touch pen while tilting it at and angle as illustrated.
How to attach the touch pen attachment to the DS lite:
See that the 2 hooks of the pen are aligned with the opening on the DS lite.
About the cleaning strap.
Well this is self-explanatory.