It's not possible to export entries from inside the app.
You can export a selection of your entries in PDF, Plain Text or email format. Just click and drag your mouse over a range of days on your calendar to select them. Then, click on any of the three icons to the right of the screen, just above the entries. This will export all the entries from your selected range of dates. The icon on the left creates a plain text report. To create a PDF report, click on the middle icon. To create an email report click on the icon on the far right.