Get your taxes done using TurboTax

Hi, I have a huge investment loss on a start up.  I tried to follow the instructions you provided and tells me only positive (gains) can be entered here.  It keeps treating my investment loss as a stock loss, giving me only a $3K deduction.  I am missing something in your guide, can you please explain how I can get it to offset my income on my 1040.  Thank you.