I don't think you would know how to buy the tag and not know how to get the pet, however if that's the case, then simply go into Class Masteries again and under the Master Class section should be Efreeti Alliance. If you have 75 CMs available, you can buy it. This adds the Efreeti Lord summoning to your spells.
Oh, and he buffs you too. I don't remember with what exactly, but I think it's 50 Dexterity and 50 FR.
Edited, Jul 18th 2009 6:50am by Solarene