Oh my goodness; be careful what you upload. I deleted the files you attached. From the file names it sounded like you may have posted a PDF of your actual tax return and an actual W-9 form on this public Internet forum. Perhaps you redacted personal/sensitive info, but if you didn't, anyone viewing this forum could have seen and downloaded your files. Luckily, it looks like only a couple of people have viewed this thread, but the forum is archived by Internet search engines, so whether it was yet, or not, there's no way to know.
In any case, in the future, for your privacy and security, please do not post any personal info in this public forum. This is mainly a user community forum, not a direct route to TurboTax Support.
You asked: "Once I submit my W-2, is it possible to add my Social Security Benefits?"
What tax year are you asking about? Did you already efile a current 2017 return, and are now asking about reporting 2017 Social Security benefits? Or are you asking about a 2016 return where you reported a W-2 last year, and are asking about reporting 2016 Social Security benefits?
Please explain your situation, and someone familiar with Social Security benefits will likely comment in this thread, but it may not be tonight.
