You can withdraw your staking rewards by clicking on the WITHDRAW button next to the total rewards value on your Staking Dashboard.
Note that you must participate in governance if you want to be able to withdraw your rewards.
Note that your rewards are automatically compounded to your total staked ADA. This means you don’t have to withdraw your reward and redelegate your ADA every epoch.
DO NOT deregister if this staking key is used as a stake pool’s reward account. This action will cause ALL pool operator’s rewards to be sent back to the reserve.
Note that you will pay a regular transaction fee for withdrawing rewards. This fee will be deducted from your wallet's balance, you cannot pay with your rewards.
If you don't have ADA in the wallet (excl. rewards), deposit at least 1 ADA first and then you will be able to withdraw rewards.