There is a one time option (just click the tab at top of screen that says one time).

Alternatively, you can cancel immediately if you'd like. It's standard stripe portal with 2 clicks or so. You will get a renewal reminder 7 days before it charges next month.

People who subscribe tend to find a lot of little annoyances with companies/refunds/travel stuff (airlines are a big one) that more than pays for the subscription. But feel free to use as is best for you.