How to pay for credit via Bank of America online banking?

and don’t tell me to call customer service, i already have several times.

Something I don’t understand is that my account balance is never current. I make my payment 5 days before the due date, and my balance doesn’t change… 2 weeks later, my balance increases, and the payment i made from my checking account while indicated by a -225 is not reflected in my credit card account s a +225.. what’s up with that?