A "Subtask" is something that you need to do first before being able to accomplish your task. In GTG, the purpose of subtasks is to cut down a task in smaller subtasks that are easier to achieve and to track down.
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To insert a subtask in the task description (this window, for instance), begin a line with "-", then write the subtask title and press Enter.
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Try inserting one subtask below. Type "- This is my first subtask!", for instance, and press Enter:
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Alternatively, you can also use the "Insert Subtask" button.
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Note that subtasks obey to some rules: first, a subtask's due date can never happen after its parent's due date and, second, when you mark a parent task as done, its subtasks will also be marked as done.
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And if you are not happy with your current tasks/subtasks organization, you can always change it by drag-and-dropping tasks on each other in the tasks list.