There are several ways, but this is the easiest one.
1. Download and install a Chrome browser plugin called
MetaMask. It will allow websites (that you authorize) to access your Ethereum account.
2. If you have just created a new MetaMask account, buy some Ethereum. The MetaMask plugin has a button that will allow you to buy directly from Coinbase or Binance. Alternatively, if you already have Ethereum in one of your wallets, you can transfer it to Metamask.
3. Once you have the plugin installed, you can click on the "Connect" button and connect your Metamask. When the connection is successful, this website will recognize it and add buttons that allow you to buy (mint) TokenData Pass NFT directly on the website in an easy form.