If you have not filed your 2016 return then do NOT click on anything that says "amend." "Amending" is a special process only used for returns that have been filed and fully processed by the IRS. You simply need to make some changes/corrections to a return before you file it. However, you are not going to be able to use the online "Set-Employed" software you are posting from. Online preparation for 2016 is permanently closed. Now you will need to switch to the desktop software to complete your return. The comparable software to online Self-Employed is Home and Business.
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
Your r2016 return will need to be printed, signed and mailed in order to file it.