Acekard 2i w/ AKAIO 1.5.1 cheat help

HiI just got my acekard and i don't understand what i must do to make cheats work. I go to the xheats menu of the game and i click a on the cheats i want to enable and then iclick select and load the game. THe cheats still don't work. What is going on? i am using cheats.dat and i have no idea what rebuild does. What must i do to enjoy cheats on Harvest Moon Sunshine Islands?!

press start>system options>press L>then enable cheat code usage

Thank you so much i didn't realize it was that easy. So then what does rebuild do?

if you want to unselect all cheats you use rebuild