Using the CoinZoom Mobile App.
1. Click on the Trade icon at the bottom middle of the screen.
2. Locate the desired cryptocurrency and click on it.
3. Click on Buy or Sell.
4. For Buying: Select the desired USD amount from the mentioned options or click on the ellipsis (...) to enter a custom amount.
5. For Selling: You can enter the amount manually or click on Sell Max to sell all/maximum allowed amount of your holdings.