Need assistance customizing items.inl and items.h

[Duke11]

Hi ! I'm not new to the forums,have been following,reading and so on ,but today i registred.
I have modified Geesu's war3ft for a while ,upgrading stronger skills,increasing them (levels and skills) . But now i really need help:
items.h

// Item Variable Defines
#define MAX_SHOPMENU_ITEMS 18
#define MAX_PLAYER_ITEMS 3
#define MAX_PAGE_ITEMS 9
#define ITEM_SLOT_ONE 0
#define ITEM_SLOT_TWO 1
#define ITEM_SLOT_THREE 2
#define ITEM_SLOT_FULL 3

Yep , i edited that but after compile i still don't have three items . What else and where should i look to edit those? Just a little +1 item , please help fellas.

Also: #define ITEM_COST_RATIO 0.0

If i have level 0 , there is no cost for items.. what should i write so 1 and 10 level have the same prices?