There are two ways to add ETH to your wallet. If you don’t currently own ETH, you can:
Buy ETH directly in MetaMask. This is only possible for US citizens.
Purchase ETH through a Coinbase wallet, another type of digital wallet, and then transfer the ETH to your MetaMask wallet using the Coinbase widget
If you currently own ETH, you can: Transfer your ETH from your existing digital wallet to your MetaMask wallet.
ust copy your MetaMask address, open up Coinbase, and click on the “Accounts” option.
Click the “Send” button, paste your MetaMask address in the box, add the amount of ETH you want to transfer, and complete the transaction.