Or did you mean your 2018 return you did last July 2019? Do you need to start 2019 return with it? If you have the .tax2018 file on your computer you can transfer it into a new 2019 online return. If you already started 2019 you will need to clear and start over or set up a new online account.
How to Transfer to the Online version
https://ttlc.intuit.com/community/entering-importing/help/how-do-i-transfer-last-year-s-return-into-...
