Send $ETH to MetaMask
Buy Ethereum through MetaMask or transfer it to your MetaMask wallet address from another wallet (e.g. Coinbase or Binance).
Visit KEI Swap
You can currently buy $KEI on KEI Swap, KEI's official decentralized exchange where you can swap any ERC20 token.
Swap $ETH for $KEI
Enter the amount of $ETH you would like to swap for $KEI. Click Connect Wallet then Swap