Help ! :( i want Edit price Globel in item mall

Hello Guys

Plase i want Edit Price Globel from item Mall

Sorry For Bad English

Plase Help me!

Code:

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DECLARE @price int
set @price = '25'--price here :D
update _RefPricePolicyofitem set Cost = @price where refpackageitemcodename = 'ITEM_MALL_GLOBAL_CHATTING' and paymentdevice = 2
select * from _Refpricepolicyofitem where refpackageitemcodename = 'ITEM_MALL_GLOBAL_CHATTING'

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The line that will appear use for media.pk2