Confirmation and reminder emails are not sent

Bobclass uses the standard email functionality of your device and therefore needs the system email app together with an active email account. You should test it using the default email app that comes with your device. It is the app with the envelope icon. If you are able to send emails from that app, you will also be able to send emails from Bobclass. If you are not, then you should first check whether you have the Mail app installed on your device. It looks like this:

If you do not find the standard mail app, then this is because someone deleted it. Unlike other built-in apps such as Safari or the Camera app, it is possible to delete the Mail app on your device. To reinstall the Mail app, do the following:

Go to the App Store
Search for "Mail" in the search field
Once you’ve found the Mail app in the App Store, tap the Cloud button to its right. The Mail app will download and reinstall on your device and you’ll be able to use it again.
At this point you probably also need to create an email account on your device, see instructions here.