Hi Keo. I'm Greg, an installation specialist, 10 year Windows MVP, and Volunteer Moderator here to help you.
You should have been able to set up your MS Account during a new PC's Setup phase.
If not go into Windows Settings > Accounts > Your Info and choose the link to Sign in with a Local Account instead, give it your name (its temporary), then after it converts restart the PC.
Go back to the same place where the link will now read "Sign in with a MS Account instead" and put in your desired MS account.
If it's already a Local Account then you can just change to MS Account directly from that link.
I hope this helps. Feel free to ask back any questions and keep me posted. If you will wait to choose if I solved your problem, I will keep working with you until it's resolved.