You don't enter them on 2018. Each year is totally separate. Sounds like your 2017 returns never got filed. Did you efile? Was it Accepted?
When you efile you get back 2 emails. The first email only confirms the transmission. The second email says if the IRS (or state) Accepted or Rejected your efile.
When you log into your account you should also see the status and if it was Accepted or Rejected, Started, Printed, Ready to Mail, etc. what does it say?