How to Create, Collection, Item and Sell NFT's on OpenSea Free [Step by Step Complete guide] https://metamask.io https://opensea.io Download MetaMask Extention Creat MetaMask Account Connect an ETH Wallet to OpenSea. First, you'll need to connect an Ethereum wallet to OpenSea. ... Create an OpenSea Collection. ... Set Up the OpenSea Collection. ... Pick the Polygon Blockchain. ... Add Item on Polygon Bloackchain..... After add item Click on Sell Unlock wallet first time and Sign in Begin Minting NFTs. ... Profit!