install cmsb with temporary url
Tim's got it right, and also, you can create a separate settings file for your development/staging environment. See cmsb/data/how_to_use_settings_files.txt for more information.
We often have a local development environment where we test and develop and then upload the files to the live server, and CMSB is designed to allow you to easily do that without having to change files every time.
Hope that helps, let me know any questions!