Some quests you have to wait until you have done the main quest that gives you "Permission" to go there. Check your other quests and see if there are any more left with the golden chalice pictured on it. Those are main story quests and doing them will get you where you need to go.
You didn't mention which quest your are working on which means the help we can give is limited to guessing which quest you are on.
From my notes, it looks like you might be working on the quest "A Fair Trade". If this is so, it looks like all you have to do is get your Parent's Ship (Pirate Skiff) after talking with the Frogfather (completing quest Quid Pro Quo - dealing with the Presidio) and go to Flotsam.
It might be that you are not a member of Pirate101 and have to pay to reach Flotsam (or maybe finish the Presidio) or become a member and get unlimited access to everywhere as long as you are a member. They do have a monthly membership and, right now, there is a sale on for the yearly membership of $60.