The following instruction is functional only when you have linked your L1NDA timetable to your personal agenda tool like Google Calendar or iCal.
Please read this article in case you have not set this yet!
After you have configured your L1NDA timetable into your online agenda tool, you can go to the preference panel for this agenda in your online agenda tool.
Below you can find an example how the Google Calendar looks like. This particular agenda shows that an reminder by email has been set twice, including a popup message to the phone.