how do I make payments on my card?

First and foremost, it depends on what type of card you are refering to

I am assuming that the card in question is a credit card. With a credit card the card company gives you a line of credit with a limit. You can charge up to the limit on the card, but don't go over the limit... keep reading →

You can either send in your payments via mail or pay online. If you want to pay online you typically have to setup your online account first before you will be able to submit a payment.