Click on the little gear under your rooms/house icon bottom right hand corner, rooms management pops open, click on a room, a star, pencil and + symbol pop up, click the pencil and change room name is available. I hope I explained this ok...good luck! Have fun in PC
To add on, try to play a contest which Shel already mentioned during Holiday season like Christmas , New Year or PCFC birthday . I just want to tell you about participate in holiday season. The rest i do not need say much .