Tickler / reminder?

I can’t tell if I’m simply missing something here but I can’t find anything about setting reminders for actions/tasks. I could sync with my calendar but I’d prefer a simple email from Nozbe or, better yet, to choose. I can’t really find any answers to this question on the forums, either. If the first point of GTD is to be comfortable ‘forgetting’ about something, surely I need to be confident that I’ll be reminded of it at the appropriate time? Toodledoo is great for this.
Can someone let me know how they implement this sort of thing in Nozbe?
Thanks!