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In the Income section, scroll down the list of topics to Investments, and choose Update next to Stocks, Bonds, etc.  On the next screen, click the down arrow next to the entry you want to edit, and choose EDIT.

If you click this, the next screen will show a Pencil Icon you can click to display your entries for editing.

If you're using TurboTax Desktop, you can also edit directly on the form in FORMS mode. 

If you imported your transactions, here's more info on How to Update or Delete Imported Data.

If you can't resolve this, post again and we'll try to help.  You can also Contact TurboTax Support for more help.