Do you know your credit card interest rate? If yes, check mark for you!
If no, you will need to call and find out. Then I would make a note of this in your financial paperwork so that you have a record.
Secondly, take a few minutes to call your credit card company and see if they will lower your interest rate, often they will with a simple phone call! Also, shop around online to see what the rates are and what other cards are available, it may be time to switch if you can find a better deal! Read up, talk to your spouse or your support system, and make a chance if it will benefit you.