First, download the latest starter pack from smealum.github.io/3ds
Update your 3ds to the latest firmware.
Then go to yls8.mtheall.com/browserhax.php and install menuhax.
auto
Oops my mistake. If you have a O3DS go to http://yls8.mtheall.com/spider28hax.php but if you have a N3DS go to...