How can I subscribe to a monthly plan?

Comecei a trabalhar com os formulários de vocês e achei o serviço excelente. Como faço para assinar por um mês e quais os meios de pagamento? Posso pagar em real brasileiro. Pode ser em cartão?

To verify, you want to upgrade your account to a paid plan and pay on a monthly basis. Is that correct?

If so, then you can login to your account, look for that man-looking icon, click on the account link, click on the upgrade button on the left and select the plan that you want to upgrade to.

You can then select the monthly payment schedule and the payment method of your preference.
Credit Card payments are accepted, but the charges are made in US$. So, you will need to use an international credit card.

Let us know if you have further questions.
Thank you.