A plain-language walkthrough for anyone doing this for the first time.
Everything here runs through your own crypto wallet -- it's your identity, and it's what actually owns the NFT once minted. If you don't have one yet, MetaMask is the most common choice: it's a free browser extension.
Minting itself is free -- there's no price built into the contract -- but you still pay Ethereum's own network fee ("gas") to process the transaction, the same way any blockchain transaction works. You'll need a small amount of real ETH sitting in your wallet before you mint.
You can buy ETH on any major exchange and send it to your wallet's address, or use an "on-ramp" (buy with a card) directly inside MetaMask itself.
Your song needs to already be uploaded to IPFS (a decentralized file storage network) before you can mint it -- same requirement as the marketplace and PlayTrace. If you've already listed a song there, you can reuse that exact same upload; nothing needs to be re-uploaded.
If you're starting from scratch, a pinning service uploads your files to IPFS and gives you back a CID (a unique address for your file):
Once you have a CID, head to the Mint page and use Step 1 there -- it reads your existing files and builds a second, small file (proper NFT metadata) for you to download and upload separately. You're not re-uploading your song or artwork, just this one extra small file.
Back on the Mint page, paste in the CID from the small metadata file you just uploaded, choose a royalty percentage (see below), and click Mint. MetaMask will pop up asking you to confirm a real transaction -- review it and confirm.
It usually takes anywhere from a few seconds to a couple of minutes to confirm on-chain, depending on network conditions.
Once confirmed, the page shows you a link to view the real transaction, plus a direct link to see your new NFT on OpenSea -- the most common place to view, share, and eventually sell it.
Your mint also shows up in this site's own public gallery, and gets posted automatically to the Community feed.