Using Bubbl.us to map a course

I am taking my third Sloan Consortium workshop, thanks to the University of Maryland's College Pass. The first two workshops were about second Life, and the third one is called "Getting Started: The First Step Toward Online Teaching." One of the "deliverables" (assignments) is a concept map of a course or part of a course. I already had an account with Bubble Us so I used that. I teach a Reading/Writing/Grammar course, and at first I tried to map out the reading part of the course, but that proved too daunting, so I did just the vocabulary part of reading. Although this is a f2f class, I tried to include online resources for each aspect of vocabulary study. Here is my concept map:



You can zoom in and out by using the scroll wheel of your mouse and click and drag to see different parts of the map. One thing I couldn't figure out is how to name the map something other than "New Sheet". I kept naming it, but the name on this map is still "New Sheet." Grrrr.