printing amended return

I received an updated 1099 after I had filed. I have used TurboTax to get to the screen that indicates: "Select Print Returns and choose "all official forms required for filing" to print out your amended returns and filing instructions." When I click on Print Return, the only option is to print my entire return and all forms. I do not know what forms I have to send to the IRS. I called support and did not receive a satisfactory answer. He suggested I just submit all the pages again. I suggested he submit this as a FIX request. No fix yet. Any suggestions?