Good Day

I have recently changed banks from STB to FNB but i still have my Credit Card with STB, 

I have linked the account from the STB Credit Card to debit from my FNB account but i make payments during the course of the month, 

How do i go about loading that onto my account as a beneficiary in order to make those transfers that occur during the month, 

Please advise, 

Thank you and regards