it comes with the download from wiibrew.org. Heres a full tut just because.
if you havent already, the upgrade to preloader v0.27. it comes with a hack.ini file. put that on the root of your sdcard. rename the preloaderv0.27-cred.dol file to boot.dol, and put it in a folder called preloader, and put it into the apps folder. run preloader. then put in the pass, witch is...
H=home
A=A
R=right
D=down
L=left
U=up
M=minus
P=plus
Congrats. preloader works!
Click
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Preloader page (wiibrew)
Direct download (from crediar's site)
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Click