Assuming that you have a Metamask wallet connected to both your Binance and Opensea account, withdrawing and selling your NFT should be easy.  - To withdraw your Binance NFT, access your Binance account and go to the NFT Asset page.  - Click withdraw and choose the NFT or the Mystery Boxes you want to sell and confirm. If you want to sell a Binance NFT that is already listed, you can go to the listing page and click withdraw. - Next, pay the gas fees in the network’s native coins, select the “Destination Wallet Address”, and confirm it. (Note: OpenSea is part of the ETH network) - Open your Metamask wallet and open the NFT library. If it is empty, click import. You can now access your Opensea account and trade your NFTs on the platform.