It is simple. Go to wiiso.com make yourself an acount. Scroll down to ds downloads. and boom smack your family members.
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First Download The SUPER converter which is about 40 sumthing mbs and select the movie/video you want to convert using super and choose the Nintendo ds file remember to right click and choose a directory to put the movie inside that folder
After that put the converted file into your r4 folder which should say MOVIES
The Nintendo DS has two slots for games. On the bottom side of the DS, there will be a large slot for Game Boy Advance games. The DS normally comes with a protective cover to prevent dust and dirt from getting inside. To insert a GBA game, all you need to do is to gently push the cartridge inside till it fits nicely
Keep in mind that this slot is removed for the DSi and DSi XL versions.
A smaller slot on the top of the DS, when it is closed, is for Nintendo DS games. When you push it in, you can hear a click and it will lock into place. When you need to remove the game card, you can push the game card again, it will click once more and pop out.
First you need to transfer the mp3/mp4 file to a DPG file. this can be done easily with Batch DPG. then transfer the files to a folder named movies on the root of the card (if your using rts/rts lite) or in the games folder (if using gold/ dual core). after that, enjoy movies on your R4!!!
It depends on the console that you have.
For NDS, you can add the GBA games to the slot -2 card.
For DS lite,you can add the GBA games to the slot -2 card.
after you install the kernel to your R4i card, you can insert the flashcard to the console, power on, and then go to find the slot-2 and you can play gba games.
For DSi / DSi xl / 3DS , you need a DStwo or ex4DS cards, and insert the flashcard directly to the slot-1.
Source : http://www.coolgadgetsgift.com/index.php?dispatch=news.list
There is a slot near the joint of the DS, it may have a lil plastic thing in it, remove it, then put your game where it use to be.