i am assuming you mean the white mask?
log into your playNC account
go into the L2 game, choose the "select character" thingy, and select the toon you want it on.
wait a week or something like that and get it outta ur WH.
That is the right page within your account. The option was between "Add Game Card" and "Game Message Boards" when I did my epic mask. It was in my inventory right after the maintenance period the following week. Are you sure you have an epic serial code associated with this account. It tells you at the bottom of that same page.