Investors & landlords

Thank you for your thoughtful, and detailed response.  

I see that it can be done according to IRS Pub 550.  How do I do this in Turbo tax?  How do I go backwards, amend past turbo tax returns to include this loss, and then include it in the current year?

 

What section do I use to make these adjustments?

 

Is it the forms section?  Which form?