Create a new reminder in any given list, then click the "i" on the far right.
In the next menu, toggle on "Remind me on a day," choose the day and time to be reminded, and then click the "Repeat" option below.
You can choose to remind yourself every day, week, two weeks, month, or year.
You can even set custom frequencies, like every 13 days, or weeks, or months, or years.