The coach will remind you a few things from time to time, just as it's presented in the official description of the software. However, in case you run into issues with the software, then the simplest thing to do is to reinstall the software, not before you create an account and attach all the data so you won't lose anything. The iOS operating system doesn't give you the option to clear cache or data for an app and the only way is to reinstall the software.
You can use their Facebook page to send them a message regarding the software: https://www.facebook.com/PersonalRunningTrainer