How do you get the unguent in RuneScape

You must have finished the f2p(free to play) quest Swept Away. Go to Port Sarim (go to Draynor and go west until you see two border guards or go through Falador, go south.) Go to Betty's shop and open the trapdoor. Go down. Finish the puzzle given to you by Betty's assistant. Beware though, this is a little harder than in the quest. After you have finished it, open the chest then search it. You must be members to get the purple ungent, or you will leave it there until you subscribe for members.