Chess.com allows you to sign in using your Google, Facebook, or Apple account and connect your Discord and Twitch accounts! These steps will guide you through connecting and disconnecting accounts.
Connect or Disconnect an External Account
Click on Settings from the menu at the bottom left corner of any page on Chess.com.
Choose Connected Accounts from the list of options on the left.
Here you'll find your connections for Facebook, Google, Apple, Twitch, and Discord. To link any of these, click Connect. To change an existing connection, click Disconnect to remove it, then Connect again to add a new connection.
You are now able to log in with your new connection!