First, create an OpenSea account and connect a wallet. You can use MetaMask, Coinbase Wallet, or another supported wallet. Now, choose a blockchain. OpenSea supports Ethereum and Polygon. Consider creating a collection. This is a way to group your NFTs together. Now, upload your NFT file. The file size must be less than 30MB. The next step is to set the price and royalties. You can set a price for your NFT and choose how much of the sale price you want to receive in royalties. Now, mint your NFT and voila, you have a unique asset with you.