Deductions & credits

I would like to ask two more questions if you don't mind answering:

1. my accountant just called me and said that since I traded options on futures those losses cannot be carried forward. Is that true? They prepared Form 6781: Gains and Losses From Section 1256 Contracts and Straddles in my 2017 return. 

2. Can I amend my 2017 tax return using turbotax CD version myself even if I didn't file 2017 return with TT?