If you've been allocated a Run, GoPeople recommends setting up a reminder to ensure you get to the Run on time.
First, go into your app and click on the Run you've been allocated. Then click "Actions", and "Reminder".
Now, if you exit the Runner's App and go to either Apple Calendar or Google Calendar, you should see your Rlisted as an event:
When you click on that Run, a reminder should already be set. Of course, you change when you want to have a reminder (and on Apple, you can have a reminder that calculates the latest you can leave):