How to enable N/D?

I'm Necromancer, press K, i can choose almost sub professions but dont have Dervish. How to enable it?
Thanks

You have to go to the secondary profession changer in the command post, i'm assuming you have unlocked paragon right? If so thats in the same place.

Go to Command Post and get your Secondary changed to dervish by the profession changer.

You may have to do some "Build the Base" quests if you havent done so yet.

You might also have to rescue koss first, as i think that's the elonian method of ascending.

thank all much, now i can cap elite skill for Dervish