To trot you will need to know how to walk.To walk you sqeese on  both legs lightly in the saddle and then you should be walking.Next when you skweese more you should go into trot when your in trot keep your heels down in the stirrups sit up tall and steer lightly but make sure your horse behaves ! When your trotting make sure you check your trot diaginals. If you need more help click on the link below.