I helped someone with the same problem but it was awhile ago and I don't think I can find that one. But try this.
First Open your return and go up to menu item
File>electronic Filing>Check Electronic Filing Status
Then save your return. Then close and reopen the program. Then update the program before you open your return, go up to Online->Check for Updates.
And before you amend you should have saved a copy of your file so you have the original. Go up to File->Save As and give it another name.
Then Amend is under Federal Taxes Tab or Personal (Home & Business)
Other Tax Situations
Other Tax Forms
Amend a Return - Click Start or Update
