Click on "Reminders"The yellow sign indicates how many reminders you have expiring today
Here you can see that you have one reminder that expires today
When you slide your mouse over the reminder, the options "Mark as resolved" and "Edit" will appearClick on "Mark as resolved"
Now you can see that under the reminders tab you no longer have reminders expiring todayThe reminder has also been removed from the Reminders list
Click on "Calendar"
Click on the "reservation" for which you just confirmed the reminder as resolved
Click on the "reservation number" to access the reservation details
Here you can see the reminder is still showing in case you want to review the reminders of the reservationThat's it. You're done!