how do i add twilight দেওয়ালপত্র on my laptop?

That is easy! Left click on the picture then save it. After that go to আপনি দেওয়ালপত্র screen and click on it. Then rite click on the ছবি আপনি want that আপনি saved. zit should work like that.... mine does all the time.

It's simple, hen আপনি find the pic, right click, then press "set as background"!