The Springboard is the main tingbot ui, basically the app launcher carousel with status bar/settings.
I have only had a short look at it after receiving my Tingbot, but I think the best way to tinker with it might be to just access it via ssh.
If you use Linux, most file managers can access it when you type something like ssh://pi@raspberrypi/ in the location bar. Otherwise, most FTP programs can access it as 'sftp'.
Don't forget to make a backup in case you break stuff.
I don't know (no TingbotOS flashed at the moment ) the best way to restart it, but would try to just run and exit an app (please correct me).