I'm trying to do it on line and it tells me I missed the deadline.
this is what I see when I click on amend.---It looks like you missed the deadline to add a state or amend your return online using TurboTax.
You can still amend. You just can not amend it online. You need to switch to the Desktop program. And Amended returns can only be printed and mailed.
For a tax year 2015 return you have until April 15, 2019 to amend the return if it shows a tax refund. If taxes are owed on the 2015 return, it can be amended and filed at any time.
The amend software should be available on your 2015 Timeline after the 2016 online editions are released sometime during the first week of December.
Or -
If you paid for one of the 2015 online editions of Plus, Deluxe, Premier or Home and Business, then you will need to contact TurboTax support and speak with an agent to get a 2015 desktop installation file pushed to your download account.
Download the tax data file from your 2015 online Timeline. See screenshot. Then open the file with the 2015 desktop program.
See this TurboTax support FAQ for a contact link and hours of operation - https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number
To contact TurboTax customer service/support use their contact website during business hours.
Submit your question/problem during business hours and then use the option for Call (a phone number will be provided for Call) to speak directly with a TurboTax agent -
https://support.turbotax.intuit.com/contact/
Note: The Call option will not be available when TurboTax Support is closed.
You can download the 2015 amendment software for Windows from here:
<a rel="nofollow" target="_blank" href="https://turbotax.intuit.com/personal-taxes/cd-download/amend/">https://turbotax.intuit.com/personal-taxes/cd-download/amend/</a>