Engineer profession

Does anyone know how to get gnomish or goblin engineering if your max level profession? I didn't know that there will be a quest chain when selecting the specilization & i just went ahead and max my profession without even starting the quest chain. I want to choose goblin engineering now, but none of the engineering npc in any major cities nor the supposed npc quest giver for goblin engineering give the quest for me at all. Is it lock after maxing character level and profession level? Or is there a solution to this? If your gonna if i tried talking to the npc that switches specialization, I already did and my engineering in my character skills tab and spellbook just says engineering. Please help, is it a bug?