timeline media is not marked/ticked on project window,how to fix that because when I share for output to DVD it give a caution that: some media files are offline and will be replaced by an offline graphic.How to fix this situation because when I continue burning the project it becomes half or less on the disc than on timeline
Your media files must be on your computer and linked to your project.
When you open your project, if you have disconnected media, a window will open directing you to relink the media files to your project.
If your media files are not on your computer (eg, they're on an external drive you disconnect or still on your camcorder or SD card) you will not be able to finish your project.
As a point of information, what version of Premiere Elements are you using and on what computer operating system is it running?