We currently do not send out notifications for tasks. We have it in our roadmap to improve or enhance how you are notified of tasks that are due but the way to manage that today would be to periodically go to your tasks page in the CRM here - https://salesscripter.com/pro/crm/tasks. On this page you will see all of your open tasks and they are sorted according to the earliest due date. This page will not notify you of what is due but it will list what is due and when.
We hope to have better options for notifications in the next 3 to 6 months.