How to sell NFTs secondarily

1. Connect your MetaMask to the OpenSea site.

2. Go to your account page. 

3. Select the pieces you wish to sell and click the "SELL" button.

4. On the setup screen that pops up, enter the desired information such as selling method, price, and schedule (for auctions), and then click the "Complete listing" button. Finally, press the "SIGN" button to complete the listing.