Get your taxes done using TurboTax

It's not easy to find, but here's how I found it:

Open TurboTax and log in
Click File on the left-hand vertical menu pane

Click the Start button to the right of Step 1 - Review your order

Click Manage my discounts in the Your product overview table

You'll see a Price Preview pane appear on the right side of your browser window - if needed, click Manage my discounts there again

Now you'll be able to apply your coupon code and see the results