To create a new entry, use the "New Entry" menu item in the File menu. You can also type Command-N to make a new entry. There is also a "New Entry" button in the toolbar by default. This creates a new entry in the currently selected journal and puts the typing focus in the Topic field for you to name the entry. Under the Topic field is the text area. Click on that or press the Tab key until the insertion point shows up in that area. Now you can enter the text for the new entry. Any changes to the entry are automatically saved periodically while you edit the entry, or immediately when you switch entries.