My amended 2018 tax return was filed and accepted. your records show the original return only. how do I get my amended 19018 file?

An amended return is not "accepted" the way an e-filed return is accepted, since an amended return cannot be e-filed.  An amended return, which must be prepared on a Form 1040X, must be printed signed and mailed.  If you did not mail a Form 1040X then you did not amend your return.

The only way to file an amended tax return is to prepare a 1040X and print, sign. and mail it.  If you did something else, like try to e-file a change, the changes were NOT TRANSMITTED.

You can amend a tax return after it has been fully processed and you have received your refund.  You must work from your return exactly as it was when you first filed it. If you changed anything, change it back to the way it was when you originally filed it, before you follow the steps to amend. Follow the TT instructions to amend a tax return:

https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed?jump_to=answer_3288565

Wait about 3 weeks and you can check the status of your amended return:

https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1

It will take about 3-4 months for the IRS to process an amended return.

https://www.irs.gov/filing/individuals/amended-returns-form-1040-x/amended-return-frequently-asked-questions