How can I place stop-loss or take-profit for coins that I already have?

You can use the Place Order feature to place stop-limit or stop-market orders, which will not block your coin balance, so you can place stop loss and take profit orders simultaneously.

Click here for the tutorial for placing stop loss and take profit orders for coins that you already have.

If you haven't bought the coin yet, you can use the Full-Trade feature to set entry, stop-loss, and take-profit for a trade all at the same time. Please refer to this article to learn more about Full Trade.