Grammarly supports linking multiple social accounts to a single Grammarly account. In most cases, this happens implicitly as part of the sign-in process.
In order to link a social account to your Grammarly account, please select Google, Facebook, or Apple at https://www.grammarly.com/signin. Keep in mind that your social accounts need to be associated with the same email address that your Grammarly account was registered with.
Once linked, you can manage accounts within the Account page. You can view the currently linked accounts and unlink them if needed.
Note: If you registered using Google, Facebook, or Apple, you can set a password for your account by following these steps.