Hi
Are you connected to the Internet during this phase of the out of box experience? If so, disconnect from it, restart then check if you can setup the account.
If not, you likely need to perform a startup repair:
Power on and off your computer three times
How do you do that?
Power on, when you see the Windows Logo - power off
Power on, when you see the Windows Logo - power off
Power on, it will then your computer will boot into the Advanced Recovery environment
You might be asked to sign in with your Microsoft Account or Local Account password.
Click Advanced Options
Click Troubleshoot
Click Advanced Options
Click System Restore, see if you can go back to an earlier time.
If not, boot into the recovery environment again, then try performing a startup repair.
If that does not work, boot into the recovery environment, then click 'Go back to previous version of Windows'
If that does not work.
Power on and off your computer three times
On the third time, your computer will boot into the Advanced Recovery environment
Click Advanced Options
Click Troubleshoot
Click Reset this PC
Click Keep my files
Choose your account
Enter your password
Click Continue
Click Reset
Resources: https://www.groovypost.com/howto/setup-configur...
Information in the above link is sourced from a trusted Microsoft MVP blog.