The most popular exchange platform to purchase or sell NFTs is OpenSea. To purchased an already minted NFT: Head to Opensea.io and click the OpenSea profile icon at the top right Click ‘Profile’ and you will be prompted by your MetaMask extension to complete several steps to allow OpenSea to set up your profile Upon reaching the final prompt, click ‘Sign’ and your account will be ready! In the search bar, look for the project whose NFT you wish to purchase and proceed to the project page. At this point, it is imperative that you select the official project OpenSea page. ONLY follow official links from the project’s Twitter or Discord channels! Once you find the NFT you wish to purchase, click on the image of the NFT If it is available for purchase, click ‘Buy Now’; which will trigger a pop up where you will be required to agree to terms/conditions before clicking ‘Checkout’ A popup will emerge from the MetaMask extension showing the ETH needed to completer your NFT purchase, along with the Gas fees Assuming you have enough ETH, click ‘Confirm’ and your transaction will be processed If all went well, your NFT will show up in your wallet and in your OpenSea profile soon after (be patient!)