Where do I enter capital losses from a sale of stocks?

[TurboTax-Esther]

If you do not have a T5008 but just a trading summary, you will use the Schedule 3-

Click the income tab > investments > capital gain 

select "Sold stocks, bonds, real estate, other capital property, or sold qualified small business corporation shares and/or qualified farm property and you have a capital gain or loss to report" and continue.

Here is where you enter your trades.  

Note that if you have a net capital loss, it will not reflect on this tax return. A loss can  be carried back 3 years or forward indefinitely to be used against a gain. To apply the loss (providing you had a gain in either of the 3 preceding years - line 127), click the 'deduction" tab and select "Losses". Request for loss carry back."

You will first see non capital losses and farming and business losses. Click through till you see "Net capital loss carry back" and enter the amounts to the maximum of the gain each year to a total of the current yr loss. Use 2014 first if there was a gain on line 127 as you will lose this next yr.

If you had no gains in either of the three preceding years, the loss will automatically carry forward.