To create a recurring task, first follow these steps to create a task.

Under the Add New Task pop up, select the toggle to "Make task recurring":

Then you will need to set the Recurrence schedule and the end date:

You can choose the Recurrence to be Daily, Weekly, Monthly, Yearly or Custom. By choosing custom recurrence, you can further refine the schedule to be Every 'x number' of days, weeks, months or years:

Once you have saved your task, it will appear in your task lists with an icon to show that it is recurring.

You can edit the series at any time by clicking on the task. It will show the following red text message to indicate that you are in a recurrence or the original task: