To obtain training from your trainer, right-click on a trainer of your class to view the training window. If you have sufficient skill points and wish to train in a skill, select the skill then hit the Train button. To view information on the skill, select the skill then hit the Info button. Be careful, once you've trained in a skill, you cannot undo your selection. If the trainer is not of your class, the training window will not be available to you. The trainer will tell you to seek out a trainer of your class. Note that you will be directed to an advanced class trainer when you reach 5th level.