If your Pocopay card has been misplaced but you think you are still able to find it, click on the card centre in the app to block your card. To confirm the action choose Card -> Block/Unblock. In that case you can unblock your card after finding it without no-one else having the opportunity to use it.
If your card is permanently lost or it has been stolen, you should block your card immediately. Once you’ve blocked the card you will be displayed the option to close the card permanently. You will be able to order a new card as a replacement to the old one.