Use GBA roms on a R4?

Hello,first off al, my English sucks.
Sorry for that. I'm from the Netherlands.I hope you can help me.
I like to play the GBA games on my DS, but it don't work.
I have a R4 card, but how do I get them on my card, working?I hope you understand my question!Greats,Nikki

you can't. R4 is a slot one flashcart, and slot 1 carts cannot play GBA roms. You need a slot 2 cart such as ezflash 3-in-1 to play GBA roms.