I just put my leg on my horse
There are many different ways people use but I was taught to make sure my horse/pony to move their shoulder away, move my seat bone, get their rib out of the way and kick their hip that way and squeeze. 😀 Hope that may help you!
Try starting off with figure eights. Once you go to change Rayne do a down transition to Trop and when you get into the opposite corner ask for the corresponding lead, once your horse has done that for a little while you can hold the Canter transition and just apply the opposite aids for the lead change,