Hi,
Make use of your mobile phone. Set reminders and alarms on your payment dates so that you do not forget any date. You must be aware that the credit card companies charge outrageously high late fees that can unnecessarily add on to your monthly payments. There are various credit card companies that even charge a late fee for a payment that is even late for a minute or two.
So, take it seriously buddy and do the needful to avoid such credit card mistakes.