What's the desired format and destination?
You should be able to export using the 5th icon from the upper right back out in the project selection user interface. How you will share/export will depend on file format used and destination. (e.g., You can save locally to Gallery/Photos (Android) or Camera Roll (iOS) when saving as JPEG of PNG. You can save to Facebook or Twitter using the "share" command in those formats provided you have those apps installed.)