Just go to "Investments" and you select the category of the asset you want to sell, then you select the asset, and then you click "sell".
After that, enter the amount you want to sell or choose to sell all your positions.
When you complete the sale, the amount will appear as "Uninvested Balance" in your investment account in a few minutes. You should note that this amount is an advance, and settlement occurs within 2 American business days.
In the period that settlement is in process, you can buy other asset(s) than the one sold.
Attention! As this stock was purchased with the balance not yet settled, selling it before the settlement deadline will result in a Good Faith Violation - for more details on this violation, click here.
Only after settlement has been completed can you transfer the amounts to your checking account.
It is not possible to cancel the sale of these assets.