Hello Luis Morales, welcome to Microsoft Q&A forum.
You’ve registered the PC and you’re signing in with your Microsoft account, right? If so, you can enter your current Microsoft account password directly on the sign‑in screen. Look for the key icon and choose the password option. This should let you in without needing to reset anything yet.
Once you're signed in, go to Settings > Accounts > Sign‑in options and add a new PIN while keeping your password as a backup.
If no password option appears at all, your only recovery path is the login‑screen reset: Shift + Restart > Troubleshoot > Reset this PC (Keep my files).