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What happens when you try to sign in, do you see any error messages? We need more information in order to help you, however, the following help articles may help.

If you can't connect or sign in to iCloud – Apple Support

If you have forgotten your Apple ID password – Apple Support

If you've forgotten your Apple ID – Apple Support

Try contacting Apple Support.

Apple Support Contact.    

Work through the screens to get an email or chat option.

Apple Support by e-mail or chat.    

Boot to the Recovery Volume (command - R on a restart). Run Disk Utility and select First Aid. Then re-install the OS.

Reinstall from macOS Recovery.    

OS X Recovery.    

I cannot set up my new MacBook Air. I started and got as far as setting up a password before it stalled. I have restarted an entred my password several times. That is all I can do.