This is a test of commonsense. Complete the next sentence:

How to block a credit card
Call your creditor or log on to your online account.
Many credit issuers allow customers to temporarily block a missing card. If your creditor offers this feature, visit their website or open your mobile app.
You can also call your creditor and have a customer service representative make the switch. If you have an online account, you'll only need to log into the website.