We have a diferent system for transmogs here in Imperia

First you will have to grind our world bosses to get a transmog tokens

then open the transmog npc select the item type you want to transmog helm / shoulder / weapon etc. 

Each transmog costs 5 transmog tokens to purchase and 1 token to transmog 

Select the item you like to buy and click on the buy button at the bottom

Then click on the transmog button on the top and select the category of the item you purchased in my case is weapon

Select the item and then click apply at the bottom

And you are all set now