You can start supporting a creator by clicking the "Become a FAN" button on each creator's page.
You can pay with PayPal, credit card, or at a convenience store, if you are in Japan.
If you don't have a credit card, we recommend supporting with a V-Preca card purchasable at convenience stores. For details please look at "What are the supported payment methods?".
Furthermore, even if you join in the middle of the month, you will be charged for the whole month. (We will not refund the difference in days)