To MetaMask sign in to MetaMask, first create a new wallet. Once you’ve done that, click the “Import Existing Wallets” button on the login page and paste in your new password. The password should be as long as your seed phrase. It is recommended to change this password periodically to prevent identity theft. It’s also a good idea to keep your private keys safe. If you lose your private keys or password, you’ll have to reset them manually.