In the PSE10 Editor the Export and Automation menus are grayed out by design. They are intended for use where third party plug-ins, add-on’s or scripts are installed.
When you have an image open in Full Edit and you have finished your adjustments, simply use:
File >> Save As
You can choose from a whole list of file formats.
You can also export directly from the PSE10 Organizer (windows only) by selecting thumbnails and clicking:
File >> Export As New Files
In PRE10 when you have finished editing your video in the timeline, click the Share button to export. There are a variety of templates to export to a folder on your hard drive or to burn a DVD etc.