After you file

I filed my taxes and waited the full 3 weeks, plus some, and never heard anything back. So I called the IRS and come to find out, I had done some traveling last year for work and missed a W-2 which made my taxes be held until I filed an amended return to correct it with the missing W-2. I did it on turbo tax and ended up recieving something in the mail from the IRS but didn't know if I needed to fill it out and send it back or if turbo tax did it since I had amended it through their site. I'm guessing I need to fill that form out and send it in. I really do appreciate all of the help from those who have answered!