How do you login to Call of Duty?

To log in to Call of Duty, launch the game and select the "Sign In" option on the main menu. Enter your Activision account credentials, or choose to log in using a linked platform account, such as PlayStation Network, Xbox Live, or Battle.net. If you don’t have an Activision account, you can create one directly from the login screen. Once logged in, you can access your profile, game modes, and friends list.