How to Add item in NPC Merchant by cheat engine

[nosseir63]

a few months ago i just edite config.pk by (PKED.exe) ...and add any item i need to Merchant and just re name the new config as dconfig
now inix changed that...so the new config (dconfig) not load...
so my question is how i can put any item in NPC store (Merchant) by using cheat engine ..
thx in advanced

[nosseir63]

i go pub of the Giant bird City
and open Pet Merchant
and then back to cheat engine....and serch for 1751 (index of black Tortoise pet)
and got about 150 results
i changed them all to 3090 ( index of santa Event mission letter)
then i reopen pet NPC...and i see that mission letter become in the Store
but because i changed alot of resuls (+150) ....game become very slow then it closed
so my question is how i get 1 or 2 results only Instead of +150 (1 or 2 address only i mean )
thx in advanced for answer

[KillerExtreme]

try memory region and browse there for the name remeber first 2-3 Numbers and change only the vaules with them thats how i make it with skillz most time