CPFP uses a spendable unconfirmed output from a pending transaction to create a child transaction with a higher fee. The in-app CPFP action is shown when the transaction is eligible.
What is a CPFP?
Child-Pays-For-Parent (CPFP) accelerates a transaction by creating a new one with a high fee using unconfirmed funds from a stuck pending transaction. Miners confirm both transactions for higher fees, speeding up the stuck transaction.
How to speed up a pending transaction
Open your Portfolio and select Pending.
Select the pending transaction you want to accelerate.
Choose the available CPFP action.
Select a network fee rate, confirm the action, and sign the transaction in your wallet.