Button Add new at the bottom of the screen makes it possible to add new questions and answers to your collection:
If you click Add new (or press Alt+A), SuperMemo will add a new item to your collection, and create two text fields: one for the question, and one for the answer.
To complete your item: (1) type the question, (2) press Esc to move to the answer field, and (3) type the answer. Press Esc again to finish changing the newly added question-answer pair.
You can jump between the question and the answer by choosing Ctrl+T. If question-answer fields are inactive (e.g. after pressing Esc a few times), you can edit the question by pressing Q or edit the answer by pressing A. You can also start editing by a mouse click.
Important! The place where your new items are added in the knowledge tree is determined by the default category, not the current selection in the contents window.