Drperit speaking: I was mistaken in what I thought we were supposed to do for phase 1 of the assignment. It turns out that what we need to do is:

Have each group member fill in the functions that they were assigned. They should do this in their own branches of trunk. Branches can be made in xcode using the copy command in the Repositories window. The project file, when opened, will automatically know that it's a branch and will commit to the correct branch directory.