The Reminder aka. Snooze functionality isas located on the card itself and displayed as a watch symbol .

How to set reminders / How to snooze

Click the watch symbol  and select one of the predefined reminder times or write a custom.

Click on Custom to set a custom reminder.

Custom reminder format

30m = 30min

1h = 1 hour

1d = 1 day

1w = 1 week

1M = 1 Month

How to view set reminder

Click on the watch symbol 

Time to trigger is displayed under the text REMIND ME IN as shown below.

Here is what a reminder looks like