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Keep your pelvis tilted slightly forward. Consider trying vocal commands.
As your horse moves, your pelvis rocks forward and backward in synch with the horse's movements. Your pelvis will naturally match your horse's gait, but you can alter your horse's speed by keeping your pelvis in position and adjusting your pelvic movements. Angle your pelvis slightly forward. Try to maintain your center of balance, and don't lean too far forward or you may get disoriented. You can try using vocal commands with your horse, but they work best when a horse has come to associate those words/sounds with a complementary action. However, some words (like "woah," "easy," and "back") are easily understood by horses due to frequent exposure. If you want your horse to respond to a verbal command like "faster," you'll need to train your horse by saying "faster" while you squeeze or gently kick the horse's sides. Be aware of your tone of voice. The tone you speak in is at least as important as the actual words you say to your horse.