Hi,
Please find below the link which has some relevant info on filing last year's tax returns
https://ttlc.intuit.com/replies/3301607
To answer your other question, Yes, you can file your tax return in 2016. Whether or not you filed in 2015 does not matter. (https://ttlc.intuit.com/questions/3664347-i-didn-t-file-in-2015-can-i-efile-2016)
Hope this helps!
