Cancelling an offer of an NFT

First, navigate to the NFT that you have made the offer in My Account \ My NFTs \ My bids:

Click on Remove Bid:

Confirmation process will appear. You will now need to confirm this action with your wallet. Your wallet will be added with the offered amount that you have made before and deducted with a small gas fee.

You can no longer view this NFT in My Account \ My NFTs \ My bids.

The owner of the NFT no longer can accept your offer.