If you are riding one handed then the reins do not cross. The tail of the reins falls on the side of the hand you are using. Like has been stated you put your index finger between the reins with your pulm down and the rest of the reins running through your hand.
Hm. I guess the way I do it isn't proper for showing :O
The way I explained works better if you're doing something other than showing. I've tried the other way explained and I didn't like it at all.
I guess my way would be more.... practical?
It's easier to go to two hands if you have to, and a lot of the time, I've found myself fiddling with a rope during a ride, and crossing the reins over is easier for that as well.
I saw the title and didn't realize it was in the WP section....
I do not belong here. XD
If you ride with a split bit or english, you rest the reins between the little finger and "hang" them on the middle 3 fingers with the thumb gently extended out naturallyy. You get the gentle pull on either side or both by just closing the 3 middle fingers-not by pulling. It is never gripped hold but very soft so if you close the fingers it means something. Not the constant tugging ect.