If I want to stop recurring payments after a month, where and how do I stop the recurring settings?

Well since right now only recurring payment is optional, how can I cancel my recurring payment if I wish to stop after a month?

Since in the past they do have non-recurring option, will this function be back soon or not?

I wanted to pay with the option of non-recurring 1 month premium but there's nowhere to be found? Is there some kind of mistakes within the payment currently?