If I have e-filed already for 2018, can I retract it and start over? Or do I have to amend it?

[KittyM · Accepted solution]

If your return is accepted, you will only be able to correct your return by amending. 

You can do this in TurboTax after your return has been processed (generally 10-21 days) and you have received your refund, if any.  

Here is a link to the instructions to Amend My Return in TurboTax.