are you guys talking about the three sculptures (from the morning, night witch's and the bandet)? if so, you can place them inthe ruins, inner temple...
you need to keep exploring the swamp.. until you get into the ruins... talk to Othra, complete her quests, an additional option would appear to go to the inner temple/gate
you place the sculptures on the statue and the gate opens..
it is very intuitive..
By any time, you can click on the small heart icon next to your health bar, then select the scroll icon on the left side.. all those quests would appear.