There are a number of ways to create slideshows in Premiere Elements. Which method did you use to creat yours?
Which version of the program are you using? The output methods vary from version to version.
Finally, when you say output to disc, do you mean output to a DVD? There are many kinds of disc outputs, depending on whether you plan to view this video on a DVD or BluRay player on your TV, on your computer, show it on a video projector, etc.
Please provide us a few more details.
The Tutorial Links Page http://forums.adobe.com/thread/1275830 may help
Premiere Elements FAQ List (2 pages of FAQ as of September 2013) http://forums.adobe.com/community/premiere_elements/premiere_elements_faq?view=all
Premiere Elements TIPS List (6 pages of Tips as of September 2013) http://forums.adobe.com/community/premiere_elements/premiere_elements_tips?view=all