Minting an NFT is the process of publishing your unique token to the blockchain.  On NFT-O-Matic, since your NFT represents ownership to an image, it also involves storing that image on IPFS.  Nfty Pete uses the image and data you entered, creates the token containing that data (which also refers to the image location on IPFS and the NFT-O-Matic smart contract) and transfers that token to your wallet on NFT-O-Matic.  Boom!  Your NFT has been minted and is all yours.