The Leader's Den is where the leader of NightClan sleeps.
Any cat may come here to talk to Stormstar. If you want to speak with her, then identify yourself in the comments. (For instance: "Stormstar? It's me, __________. Can I come in?")
Only the deputy and the medicine cat are allowed in without permission.
Go out to the clearing.
Or, just go back to the camp.