Post by lankybrit
Go the twilight Highlands page on wowhead. About 3 thirds of the way down in the comments is this (note that the original has all the links):
If you don't have the Command board quest and Garrosh doesn't have one for you, and you haven't got any of the others either, I don't know what to tell you.
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Here are detailed steps for Horde to opening Dragonmaw Port in the Twilight Highlands, and unlocking the portal to Orgrimmar.
Level to 84.
Get
Warchief's Command: Twilight Highlands! from the Warchief's Command Board, and talk to Garrosh Hellscream in Orgrimmar.
Garrosh will give you two chains, which you complete in Orgrimmar:
Inspect the demolishers-
Machines of War
Weapons of Mass Dysfunction
Acquire the map-
Sauranok Will Point the Way
Unfamiliar Waters
Completing these quests will unlock the following, in which you are sent to Bilgewater Harbor in Azshara:
Where Is My Warfleet?
Warlord Krogg will then give you the following quests to do in Bilgewater Harbor:
Discipline the grunts-
Ready the Ground Troops
Check the ship-
Ready the Navy
Beating the Market
You also need to complete Captain Krazz's chain of quests in Bilgewater Harbor:
Ready the Air Force
Smoot's Samophlange
Pre-Flight Checklist
Completing both Krogg's and Krazz's chains will unlock:
Twilight Skies
Which requires you to ride the zeppelin to the Twilight Highlands. It may take a few minutes for the zeppelin to arrive. You must ride it and watch the full cutscreen in order to progress to the chains to open Dragonmaw Port.
Cheers.
Post by Cambo
Do this quest line from Orgrimmar to Twilight Highlands.