I bought a rental house in 2007 for $335,000. I had to sell it in 2014 for $295,000 and lost $40,000 of my investment. How do I list this on my tax return

Go to the income tab >Investments > Capital gains > Tick the first box for sale of stocks bonds and capital property and then continue.  Fill in the appropriate answers in the following pages.

It's is reported on schedule 3. I don't know how you will do it in TT.