Seems pretty clear to me. OP is trying to get homebrew and b9s on his 3ds, using sudoku (and presumably seedminer method).
but really, if you follow every step and don't skip any, it's pretty straight forward:
https://3ds.hacks.guide/get-started
but that guide doesn't seem to have the dsiware part anymore. Seems focused on steelhax.
perhaps try this guide as well? Not all that well designed, but it may help:
https://marenthyu.github.io/3dsSeedMinerGuide/index.html