You can choose to send automated reminders to the assignee's of overdue tasks, select the settings cog in the top right, turn on the Send automatic reminders toggle and select the date that you'd like to send the reminder.
When a task is overdue by the selected time frame, an automated email reminder will be sent to the assignee.
If you'd like to manually send a reminder regarding a task, select the 3 dots next to the task and click send reminder
