In Trader Talent Pro, go to the bid or ask column each side of the price and right click at a price you wish to have the order triggered at.
In the image below the trader has right clicked in the cell to the right of 3279 to place the stop.
As soon as the market reaches that price and trades it, the stop order will search for the best bid to sell into. Usually this will be the same price but if the market is thin or the order coming through the market which triggered it has already absorbed everything on the bid at that price, or more further down the book, your stop may execute where it can find the next available bid. This difference is referred to in trading as 'slippage.'
Orders in Trader Talent Pro are not stored on your computer and sent to the exchange when the price trades but rather they are co-located on CQG's order system for fastest possible execution so slippage is minimised. This is one of the many reasons it is considered to be in the top 5 futures trading platforms.