I'm assuming you are doing this in a western style (mainly for the turn on the hind end), and assuming the horse knows how to do the maneuver.
Hindquarters to the right - This requires moving the shoulders, so I am taking my reins to the right - this can either be a neck rein or a combination neck rein and direct rein. My left leg is at the girth pushing the shoulders over to the right. Remember it is a forward motion maneuver. That means I will walk and trot my horses in and out of this maneuver, and if we are having difficulties I will always push them out of it to the front. I will also be walking or jogging a slow circle and pull them back a bit to stop the hind end but keep the front end moving around themselves. I hope that makes sense ? Anyways, here is a video of me on a very green broke horse as he was learning how to turn on the hind end. It's not perfect, but shows the cues and how you ask for it.
Towards the end you can see how I use the walk out and circle method some. Oh, and the reason he was on the wrong foot was because I still didn't have enough forward motion. Here's a video where it is working right with minimal cues.
For turns on the foreend, to the right (head goes right, hind end goes left), you keep the front end still with your hands and use your right leg to press the hind end around. Sorry, but I don't have a video of that.
Just remember, as you are learning the turns you only need a couple of steps, or even one step at a time.