@ RonPaiva
Yes, everyone has to enter a 5-digit Self-Select PIN when prompted, where you choose the 5 digits. That is what "signs" the return electronically. If you wish, you can use the same digits you used last year, or you can use new ones.
You'll also have to verify the efiling by entering your 2018 AGI when prompted (or less commonly one could alternatively use the 2018 Self-Select PIN for verification). And it will ask for "today's date" when signing. And I believe you also have to enter your DOB. I can't view that exact screen right now.
