Enter your trade when the high (or low) of the entry bar (the bar when the 50 bar CCI crossed the zero line) is broken by a subsequent bar. There is no default order type for the zero line cross trade entry, but for the YM the recommendation is a limit order.
As soon as your entry order has been filled, make sure that your trading software has placed your target and stop loss orders, or place them manually if necessary. There is no default order type for either the target or stop loss, but for the YM (and usually for all markets), the recommendation is a limit order for the target, and a stop order for the stop loss.
In the trade shown on the charts, the entry bar is shown is white, and the entry is when the subsequent bar breaks the low of the entry bar, which is at 12270, with a target of 12250, and a stop loss of 12280.