Limit orders are working in the market as soon as they are submitted. If a limit order trades it will be filled at the limit price or better.
When submitting an order into the chart you there are different prompts you can enable. For this example we went to the Tap2Trade Properties and set the order confirmation to order ticket. We we tapped in the sell column and below is how the order ticket looks. We set the price for 21162 and then clicked submit. The order ticket is handy to accurately submit at the price you want.
After clicking submit you will see your order indicated with a red circle to show it is a sell order. If it was a buy it would be blue. You can tap the red circle to bring up the details of the order and it also gives you the ability to pull the order with the pull order button Image