Make sure, if your using priiloader v0.7-236 MOD that hacks.ini/hacks-hash.ini is in the priiloader apps folder.
Anyway, do the following:
- Press and hold reset on your console to load priiloader
- select system hacks
- enable all region free hacks
- save
- press B, then select system menu or hbc
Edit: By the way... ModMii downloads and extracts hacks.ini/hacks-hash.ini to the root of the SD Card or the "COPY_TO_SD" folder.