How buying works

1. Connect a browser wallet. MetaMask, Rabby or the Coinbase extension, set to Sepolia. The page switches the network for you if you allow it. You need the price plus a little test ETH for gas; any Sepolia faucet will do.
2. Approve the exact price. Your wallet shows one transaction to the contract for the listed amount. The contract rejects any other amount.
3. The token is minted to you. It is a one of one: once it is yours, nobody else can buy it. This runs on a test network, so the ETH has no value.