Desktop MetaTrader:

To do so please right click on any trading pair in the Market Watch window. You can then choose the option “New order” and execution type as Pending Order. 

After that you will be able to set volume, stop loss, and take profit, choose the order type (Buy Stop / Buy Limit / Sell Stop / Sell Limit) , pending order opening price and pending order expiry date. 

Mobile MetaTrader

To set pending orders on the MT4 android platform, go to the “Quotes” tab and then pick the instrument. 

You can then choose the option “New order” and type of execution. Next, choose one from four pending trade solutions: buy stop, sell stop, buy limit, or sell limit. After that, set volume, stop loss, and target.