how to edit coin with nsmbe for nsmb ds ?
Please help me with my hack rom !
I'm open to all possible answers as long as it helps me.
my game:

Palette: /BG_ncl/d_2d_A_J_jyotyu.ncl.bin
Texture: /obj/A_block_ncg.bin

Hope this is what you're looking for
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thank you KTRMAmbiance ! That's exactly what I was looking for. You help me tremendously!!
it doesn't change the in-game room... But I was able to at least design it thanks to you!

you should also change the jyotyu tileset
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ok, now there is a result: i can see my modified parts but only when it's a block with a part in it.

you should follow the rest of meromero's guide, as it includes extra files you need to modify, or you could modify all the files individually and replace them with your custom one
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That is to say?

not really a guide per se, but it does list the files that have the coin graphics (d_2d_TEN_A_J_jyotyu_ncg.bin and A_block_ncg.bin, as well as the tileset itself)

Okay, thanks for these explanations!
but my game is on the nds

yeah, but you should modify the nsmbds romfs using nsmbe, not directly on the ds. replace the original files in their directories in the romfs with meromero's ones, OR, if you want, just take a throwaway rom, and then put the original .bin files over something else to edit them, save and (after you've edited them) re-export them then replace the ones from your main rom (the one thats been modified for your hack) with the new ones you just edited and exported. this may be a bit hard to understand, as I'm not the best at explaining things, so if you want a more thorough explanation, you could try searching.
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Okay, I understood the essentials, thank you very much for these explanations! They will be very useful to me!