Signal to enter. If the price is touching the border we are waiting the reversal signals from any of the indicators we are comfortable with. If the price is touching the channel two times and did not break the channel out it means that price will be inside the channel (most probably). So it is our case.

Personally I did not wait until the price will touch the border two times: I waited for the reversal and open the order. If we are not sure about reversal we may place pending order. But all the orders should be placed on the direction to inside the channel.