iRED

Hi all, just under a month ago I purchased ESET Nod32 Antivirus. Instead of purchasing the annual licence, I opted for the monthly subscription. I assumed this would be billed monthly automaticity however, the program flagged up today that the licence is due to expire soon and to renew. My question is, am I required to renew myself each month manually and input a new username/licence key? My understating is that it renewed each month, rolling until I cancel. Thank you, Ad