http://www.gamefaqs.com/console/snes/file/564404/14784 Note some of the names are different or some of the codes are incorrectly placed for a certain character.
Not sure what emulator you're using but you put those codes in the cheat code box. for example if you wanted to raise Sigurd's strength you type 7e2d41** in the codebox (the ** means what number you wanted to raise it too) so it would look like 7e2d4199 if you wanted to raise Sigurd's strength to the max, and also one of the moderators of this board, VincentASM has codes for this game too. (if i recall correctly)