If you have an NFT up for sale that you want to remove from sale, you can use the DELIST feature.
Go to the item page you want to delist and click on the REMOVE FROM SALE button on the right hand side of your browser.
A message will appear to confirm your action. Once you click on I UNDERSTAND, your wallet will pop up to sign the transaction.
If you remove an item from sale, you can always list it back for sale. You can also decide to BURN it in order to permanently delete the NFT.