Don't worry it's not a dumb question!
Outside of every stateroom, there is a pewter fish that was designed to hold any mail or messages you might receive from
DCL. Some people hang a pocket organizer or "fish extender" on it that can hold more goodies or gifts. You may participate in a gift exchange with fellow cruisers, where you drop off little gifts in each others fish extender. If there is a meets thread for your cruise date, someone may have already started to organize an exchange. Here is a link which shows a fish extender hanging outside a stateroom:
http://www.disboards.com/showthread.php?t=1219607
Hope that made sense!