These slides are in View Only status. This gives you a preview before you go to File, Make a copy and save them to your Google Drive as Owner.
To use just one or a few of the slides, go to slides.new
Name your slide deck
Go to File, Import Slides
Choose Slide deck and select just the slide you want to import (Copy and Paste will do this too.)
Open the shared Drive folder in a new window to see all the files.