Replace: The account on your Time Machine backup will replace the identically named account on your Mac.Rename: The account on your Time Machine backup will appear as an additional user on your Mac, with a separate login and home folder.In the example pictured here, John Appleseed is a user account. If an account on your Mac has the same name, Migration Assistant asks whether to rename or replace: Before clicking Continue, learn what it means to transfer a user account.Select your Time Machine backup, then click Continue.
If your Mac starts up to a setup assistant, which asks for details like your country and network, continue to the next step, because the setup assistant includes a migration assistant. It's in the Utilities folder of your Applications folder. For example, if your Mac starts up to a flashing question mark, you need to first reinstall macOS.