You can link a KRAFTON ID, Google Account, or Apple Account by tapping Settings → Basic → Linked Platforms → Link in the top-right corner of the in-game lobby.

You can link your account at any time, even after starting with a guest account. Once linked, you can access the same game data across multiple devices.

However, on AOS devices with less than 4GB of RAM, the option to link an Apple account is not displayed due to the risk of crashes.