Once you have done the acess, I'd say the easier way to go to Ferumbras Citadel is using a Boots of Homecoming
You see boots of homecoming (Arm:2).
It can only be wielded properly by players of level 100 or higher.
It weighs 16.00 oz.
They are made of dark red buckskin and the golden clasps look like the letter F.
It cost around 100-200k at my server, once used inside of a Protection Zone, they will teleport you in front of the Ferumbras Citadel and the text will appear:
"Magical sparks whirl around the boots and suddenly you are somewhere else."
Note: These boots have a 24 hour cooldown and cannot be verified by looking at them. Only way to verify them is putting them in depot and looking on them at the market, seeing as only a pair with charges can be sold via the market