How do i find my

[PSU Imp]

Friend code and how do i connect to the ps0 internet
(i already have wifi set up on my dsi i just dont know how to get on the internet on ps0

[Parasite159]

once you have wifi set up on setup1-3 just goto the nintendo Wi-fi connection option under your character mode selection(just below story mode, DS wireless play). your friend code can be found in your friends roster.
alternatively read the manual

[Soda]

if the wifi aint working reastart router.from your dsi settings go to internet and you can set up what connection you want to use if psz isnt picking it up