It really depends if your talking advanced or beginner. Try going on www.google.com and looking up dressage techniques. Good Luck!

 yer, well you could simply have your leg back a little too far and if your horse is trained they are most likely to respond to it. search the net for dressage movements or even ask someone you know that is 'horsey' some one like a riding instructor etc. good luck by the way i do dressage ! and i love it... bi!

 You can go on the internet and look up dressage and the techniques