I just realized my tax return was rejected in 2016? What should i do? Also how can i view my 2016 tax return it wont download.

Something must have gone wrong with your e-file.  Either you did not actually go all the way through to the orange button that said "Transmit Return Now" and complete the process, or your tax return was rejected and you did not notice or follow up.  At this point, you have to print, sign and mail it 

To call TurboTax customer support

https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number

They are available from 5 a.m. to 5 p.m. Pacific time.

To finish a prior year return started in TT online:https://ttlc.intuit.com/questions/2559403-how-do-i-finish-a-prior-year-return-that-i-started-in-turb

When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s.  Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS and/or your state received the return.